Package

Information

  • Patent Grant
  • 6220443
  • Patent Number
    6,220,443
  • Date Filed
    Thursday, April 22, 1999
    25 years ago
  • Date Issued
    Tuesday, April 24, 2001
    23 years ago
  • Inventors
  • Examiners
    • Foster; Jim
    Agents
    • Ostrolenk, Faber, Gerb & Soffen, LLP
Abstract
A package that is manipulable between an encapsulating position, for shipping or storing, and a displaying position, for exposing and retaining, an object. An embodiment configured according to principles of the invention includes a main compartment with a main aperture for retaining an object. The package has one or more manipulable adjacent compartments, each with an adjacent aperture, which maintain the object in the adjacent aperture when the package is in the closed position.
Description




BACKGROUND OF THE INVENTION




1. Field of the Invention




The invention relates to packaging for shipping and displaying objects.




2. Discussion of Related Art




Product packaging has evolved from being merely a shipping aid into a crucial marketing tool. More than ever, package design is directed to enhancing product attractiveness. Many different package designs have been developed which provide for both protecting products during shipping and displaying the products in a marketplace once shipped. Some designs provide perforations or other conventions for severing a package wall or walls so that portions of the package may be folded away to expose the contents of the package. See, for example, U.S. Pat. No. Des. 141,077, issued May 1, 1945, to J. P. Sawyer, entitled Display Box; U.S. Pat. No. 2,324,436, issued Jul. 13, 1943, to D. J. Snyder, entitled Packing And Display Case; and U.S. Pat. No. 2,706,037, issued Apr. 12, 1955, to H. A. Feigelman, entitled Folding Shipping And Display Boxes.




Other designs provide a manipulable package including one or more panels, each having an aperture for viewing the package contents. See, for example, U.S. Pat. No. 611,063, issued Sep. 20, 1898, to C. E. Davis, entitled Counter Display Box; U.S. Pat. No. 1,210,008, issued Dec. 26, 1916, to J. B. Singer et al., entitled Display Device; U.S. Pat. No. 3,357,543, issued Dec. 12, 1967, to R. B. Taggart, entitled Display And Gift Box; and U.S. Pat. No. 4,462,178, issued Jul. 31, 1984, to S. D. Freeman, entitled Display Structure Formed Of A Unitary Blank.




Some designs provide an internal panel, or combination of panels essentially functioning as a singular panel, having apertures, each for receiving, but not retaining, an object. See, for example, U.S. Pat. No. 1,171,083, issued Feb. 8, 1916, to B. F. Bailey, entitled Egg Box; and U.S. Pat. No. 2,019,414, issued Oct. 29, 1935, to O. L. Isacson, entitled Box For Packing Eggs And Similar Fragile Objects.




Other designs provide for retaining an object with cooperating slotted internal panels and exposing the contents to some extent. However, complete access to the contents requires destruction of the package. See, for example, U.S. Pat. No. 4,779,726, issued Oct. 25, 1988, to M. S. Pratt, entitled Packaging.




Still other designs provide for a package composed of hinged prism-like compartments which may be manipulated to register apertures in each compartment and receive objects. However, the apertures do not positively retain the object. See, for example, U.S. Pat. No. 5,322,210, issued Jun. 21, 1994, to J. P. Chila et al., entitled Display Box.




Unfortunately, none of the foregoing provides a package that is manipulable between an encapsulating position, for shipping or storing, and a displaying position, for exposing and retaining, an object. None of the aforementioned references, taken alone or in combination, are seen as teaching or suggesting the presently claimed Package.




SUMMARY OF THE INVENTION




The invention is a package that is manipulable between an encapsulating position, for shipping or storing, and a displaying position, for exposing and retaining, an object. The invention provides a package for storing, shipping, protecting, retaining, displaying and promoting an object. The invention provides improved elements and arrangements thereof, in an apparatus for the purposes described which are inexpensive, dependable and effective in accomplishing its intended purposes.




An embodiment configured according to principles of the invention includes a main compartment with a main aperture for retaining an object. The package has one or more manipulable adjacent compartments, each with an adjacent aperture, which accommodate the object. The adjacent compartments may maintain the object in the adjacent aperture when the package is in the closed position.




These and other features of the invention will be appreciated more readily in view of the drawings and detailed description below.











BRIEF DESCRIPTION OF THE DRAWINGS




The invention is described in detail below with reference to the following drawings, throughout which similar reference characters denote corresponding features consistently, wherein:





FIG. 1

is a top right front elevational view of an embodiment of a package, manipulated into an open position, constructed according to principles of the invention;





FIG. 2

is a top right front elevational view of the embodiment of

FIG. 1

, manipulated into a closed position;





FIG. 3

is a plan view of a blank for an inner panel of the embodiment of

FIG. 1

;





FIG. 4

is a plan view of a blank for an outer panel of the embodiment of

FIG. 1

;





FIG. 5

is a top right front elevational view of the embodiment of

FIG. 3

, in a folded configuration prior to assembly with the embodiment of

FIG. 6

;





FIG. 6

is a top right front elevational view of the embodiment of

FIG. 4

, in a folded configuration prior to assembly with the embodiment of

FIG. 5

;





FIG. 7

is a partial cross-sectional detail view of the main compartment of the embodiment of

FIG. 1

, drawn along line VII—VII in

FIG. 1

;





FIG. 8

is a horizontal, cross-sectional detail view of a compartment having a non-planar interior panel;





FIG. 9

is a top right front elevational view of the embodiment of

FIG. 1

, retaining a first object;





FIG. 10

is a top right front elevational view of the embodiment of

FIG. 1

, retaining a second object;





FIG. 11

is a top right front elevational view of another embodiment of a package, manipulated into an open position, constructed according to principles of the invention;





FIG. 12

is a top right front elevational view of the embodiment of

FIG. 11

, manipulated into a closed position;





FIG. 13

is a plan view of a blank for an inner panel of the embodiment of

FIG. 11

;





FIG. 14

is a plan view of a blank for an outer panel of the embodiment of

FIG. 11

;





FIG. 15

is a top right front elevational view of the embodiment of

FIG. 11

, retaining a first object;





FIG. 16

is a top right front elevational view of the embodiment of

FIG. 11

, retaining a second object;





FIG. 17

is a top right front elevational view of the embodiment of

FIG. 11

, retaining a third object;





FIG. 18

is a top right front elevational view of a further embodiment of a package, manipulated into an open position, constructed according to principles of the invention;





FIG. 19

is a top right front elevational view of the embodiment of

FIG. 18

, manipulated into a closed position;





FIG. 20

is a plan view of a blank for an inner panel of the embodiment of

FIG. 18

;





FIG. 21

is a plan view of a blank for an outer panel of the embodiment of

FIG. 18

;





FIG. 22

is a top right front elevational view of the embodiment of

FIG. 18

, retaining a first object;





FIG. 23

is a top right front elevational view of the embodiment of

FIG. 18

, retaining a second object; and





FIG. 24

is a top right front elevational view of an additional embodiment of a package, manipulated into an open position, constructed according to principles of the invention, retaining a first and a second object.











DETAILED DESCRIPTION OF THE INVENTION




The invention provides a convertible package for concealing and exposing a retained object. The package is manipulable between an encapsulating position, for shipping or storing, and a displaying position, for exposing, a retained object.




Referring to

FIG. 1

, one embodiment of a package


100


configured according to principles of the invention is shown manipulated into an open position.

FIG. 2

shows the package


100


manipulated into a closed position. The package


100


has a main compartment


102




a


with a main aperture


104




a


for retaining an object (not shown). The package


100


has manipulable adjacent compartments


102




b


each with an adjacent aperture


104




b


which accommodate the object (not shown). The adjacent compartments


102




b


may maintain the object (not shown) in the adjacent apertures


104




b


when the package


100


is in the closed position. However, the apertures


104




b


do not retain or seize the object (not shown) or otherwise discourage dislodgement from the adjacent compartment


102




b.






Referring also to

FIGS. 3 and 5

, the package


100


includes an inner blank


106


that is folded along fold lines


108


, defining a plurality of interior panels


110




a


and


110




b.


The main interior panel


110




a


provides the main aperture


104




a


and the adjacent interior panels


110




b


provide the adjacent apertures


104




b.






In this embodiment, as shown on

FIGS. 1

,


5


and


7


, the main interior panel


110




a


essentially defines a plane, thus the main aperture


104




a


falls essentially within a plane. Although the invention does not require that the main interior panel


110




a


or main aperture


104




a


remain in a plane, the main aperture


104




a


is configured to retain an object. Retaining an object is achieved best with, but not limited to, a planar main interior panel with an aperture for receiving and retaining the object.




Retaining an object includes restricting the ability of the object to become dislodged from the compartment


102




a.


Preventing dislodgement is achieved, for example, by squeezing the object. Referring to

FIG. 7

, when the main aperture


104




a


remains in one plane, the annular inner edge


112




a


of the main aperture


104




a


contacts or “bites” into the side of an appropriately sized object inserted therein, generally orthogonally with respect to the insertion direction


114


. The contact forces


116




a


which squeeze an object or resist its passage through the main aperture


104




a


substantially have a common locus also within the plane of the main interior panel. This convention promotes stable maintenance of an object once inserted because the contact forces


116




a


are balanced, falling substantially within the plane of the main interior panel, thus have marginal orthogonal force components which would urge the object from the main aperture


104




a.


For example, when the package is intended to retain an object, such as a ball, the main aperture


104




a


may be configured with a diameter


118




a


that is equal to or less than the diameter of the ball. In the case of a baseball, which generally is symmetrical about any axis, the aperture


104




a


may be configured with a circular shape having an annular edge that bites into the soft surface of the ball.




Referring to

FIG. 8

, where an aperture A occurs over multiple planes P


1


and P


2


, the inner edge E of the aperture A contacts the side of an inserted object with normal forces N that are not balanced, but have significant orthogonal force components that would urge the object from the main aperture A.




Referring again to

FIG. 1

, the package


100


also may restrict object dislodgment therefrom by providing a passage that discourages passage of the object. For example, the aperture


104




a


may be configured with a circular shape having a diameter that is slightly smaller than the diameter of the ball so that, once slightly more than half of the ball is forced through the aperture, the relatively smaller aperture will resist passage of the ball back through. To this end, the main interior panel


110




a


may be constructed from material that deforms sufficiently to allow forceful introduction of the ball through the main aperture


104




a


and regains a sufficient amount of its relatively smaller pre-insertion configuration.




For irregularly-shaped objects, such as a bottle, the main aperture


104




a


may correspond to an outer surface of the bottle, as shown in the embodiment of

FIG. 10

, for example. The edge


112




a


of the aperture


104




a


need not entirely contact an inserted object, only a sufficient amount of the object that the aperture


104




a


can grip, overlap or otherwise resist object dislodgement.




Referring again to

FIGS. 1

,


3


and


5


, the adjacent interior panels


110




b


are folded along fold lines


120


, respectively, defining sub-panels


122




a


and


122




b.


Thus, adjacent apertures


104




b


occur on diverse planes defined by the sub-panels


122




a


and


122




b.


The adjacent apertures


104




b


are configured to contact or maintain an object when the package


100


is in the closed position, as shown in FIG.


2


. To this end, the adjacent apertures


104




b


may be sized to complement or be oversized with respect to the surface of the object which the adjacent apertures


104




b


contact. Maintaining an object means that the object substantially is prevented from moving. Maintaining does not mean that the object is positively retained, squeezed or otherwise engaged by the aperture


104




b.


In maintaining an object, the adjacent interior panels


110




b


and adjacent apertures


104




b


function like pedestals under free-standing objects.




Referring to

FIGS. 1

,


4


and


6


, the package


100


includes an exterior blank


124


that is folded along fold lines


126




a


and


126




b,


defining a plurality of panels


128




a-c.


As shown in

FIG. 1

, the main exterior panels


128




a-b


and main interior panel


110




a


define the main compartment


102




a.


Each adjacent exterior panel


128




c


and set of sub-panels


122




a


and


122




b


define an adjacent compartment


102




b.






Referring to

FIGS. 4 and 6

, the exterior blank


124


mounts onto the interior blank


106


with glued tabs configured to maintain the interior blank


106


in the intended design positions, as shown in

FIGS. 1

,


2


and


5


. To that end, the main exterior panel


128




a


of the exterior blank


124


includes flaps


130




a


that fold along fold lines


132




a


toward the viewer until each flap


130




a


defines essentially a right dihedral angle with the main exterior panel


128




a.


The main exterior panel


128




a


is folded along fold line


126




a


toward the viewer until the lateral edges


134




a


abut the main exterior panel


128




b.


Abutment of the lateral edges


134




a


and main exterior panel


128




b


is not critical to the design, but aids in assembly of the package


100


. Offsetting the lateral edges


134




a


from the fold line


126




a


also is not critical, but aids in assembly of the package


100


.




The main exterior panel


128




b


includes flaps


130




b


with tabs


136




b.


Once the main exterior panels


128




a


and


b


and flaps


130




a


are positioned, the flaps


130




b


are folded along fold lines


132




b


toward the viewer until each flap


130




b


contacts a flap


130




a


and defines essentially a right dihedral angle with the main exterior panel


128




b.


Contact between the flaps


130




a


and


b


is not critical to the invention, but such enhances package integrity. Once the flaps


130




b


are positioned, tabs


136




b


are folded along fold lines


138




b


toward each other and positioned to mate with main interior panel


110




a,


as shown in FIG.


6


.




The adjacent exterior panels


128




c


each include flaps


130




c


with tabs


136




c


and


d.


The flaps


130




c


are folded along fold lines


132




c


toward the viewer until each flap


130




c


defines essentially a right dihedral angle with its associated adjacent exterior panel


128




c.


Once the flaps


130




c


are positioned, tabs


136




c


are folded along fold lines


138




c


toward each other and positioned to mate with a sub-panel


122




a,


as shown in FIG.


6


. Tabs


136




d


are folded along fold lines


138




d


toward each other and positioned to mate with a sub-panel


122




b,


as shown in FIG.


6


.




The outermost adjacent exterior panels


128




c


also include tabs


136




e


which are folded along fold lines


138




e


toward the viewer and positioned to mate with a sub-panel


122




b,


as shown in FIG.


6


.




All embodiments of the invention are adaptable for protecting various objects during shipment and for retaining and displaying them. For example,

FIG. 9

shows the package


100


retaining and displaying a baseball B.

FIG. 10

shows the package


100


retaining and displaying a perfume bottle P.




Referring to

FIG. 11

, another embodiment of a package


200


configured according to principles of the invention is shown manipulated into an open position.

FIG. 12

shows the package


200


manipulated into a closed position. The package


200


has a main compartment


202




a


with a main aperture


204




a


for retaining an object (not shown). The package


200


has manipulable adjacent compartments


202




b


each with an adjacent aperture


204




b


which accommodate the object (not shown). The adjacent compartments


202




b


may maintain the object (not shown) in the adjacent aperture


204




a


when the package


200


is in the closed position.




Referring also to

FIG. 13

, the package


200


includes an inner blank


206


that is folded along fold lines


208


, defining a plurality of interior panels


210




a


and


210




b.


The main interior panel


210




a


provides the main aperture


204




a


and the adjacent interior panels


210




b


provide the adjacent apertures


204




b.


In this embodiment, as shown on

FIG. 11

, the main interior panel


210




a


essentially defines a plane, thus the main aperture


204




a


falls essentially within a plane. As with the foregoing embodiment of the package


100


, this embodiment of a package


200


does not require that the main interior panel


210




a


or main aperture


204




a


remain in a plane, only that the main aperture


204




a


be configured to retain an object. Also, the principles pertaining to retaining an object with the main compartment


202




a


of the package


200


are substantially similar to the principles discussed for the foregoing embodiment.




The adjacent interior panels


210




b


are folded along fold lines


220


, respectively, defining sub-panels


222




a


and


222




b.


Thus, adjacent apertures


204




b


occur on diverse planes defined by the sub-panels


222




a


and


222




b.


As with the foregoing embodiment, the adjacent apertures


204




b


are configured to contact or maintain an object when the package


100


is in the closed position, as shown in FIG.


12


. Also, the principles pertaining to maintaining an object with the adjacent compartments


202




b


of the package


200


are substantially similar to the principles discussed for the foregoing embodiment.




Referring to

FIGS. 11 and 14

, the package


200


includes an exterior blank


224


that is folded along fold lines


226




a-c,


defining a plurality of panels


228




a-d.


As shown in

FIG. 11

, the main exterior panels


228




a-b


and main interior panel


210




a


define the main compartment


202




a.


Each set of adjacent exterior panels


128




c-d


and corresponding set of sub-panels


222




a


and


222




b


define an adjacent compartment


202




b.






The exterior blank


224


mounts onto the interior blank


206


with glued tabs configured to maintain the interior blank


206


in the intended design positions. To that end, the main exterior panel


228




a


of the exterior blank


224


includes flaps


230




a


that fold along fold lines


232




a


toward the viewer until each flap


230




a


defines essentially a right dihedral angle with the main exterior panel


228




a.


Each flap


230




a


has tabs


236




a


and


b


extending therefrom. Once the flaps


230




a


are positioned, the tabs


236




a


are folded along fold lines


238




a


toward each other and positioned to mate with main interior panel


210




a.


Tabs


236




b


are folded along fold lines


238




b


toward each other and positioned to mate with adjacent exterior panels


228




b.


The adjacent exterior panels


228




b


are folded along fold lines


232




b


until in contact with the tabs


236




b.






Each adjacent exterior panel


228




d


of the exterior blank


224


includes flaps


230




d


that fold along fold lines


232




d


toward the viewer until each flap


230




d


defines essentially a right dihedral angle with the adjacent exterior panel


228




d.


Each flap


230




d


has tabs


236




c-e


extending therefrom. Once the flaps


230




d


are positioned, the tabs


236




d


are folded along fold lines


238




d


toward each other and positioned to mate with sub-panel


222




a.


Each set of tabs


236




c


and


e


on each flap


230




d


are folded along fold lines


238




c


and


e,


respectively, toward each other. Tabs


236




c


are positioned to mate with adjacent exterior panel


228




c.


Tabs


236




e


are positioned to mate with sub-panel


222




b.


Tabs


236




f


are folded along fold lines


238




f


and also positioned to mate with sub-panel


222




b.






Again, all embodiments of the invention are adaptable for protecting various objects during shipment and for retaining and displaying them. For example,

FIG. 15

illustrates the package


200


retaining and displaying a can C.

FIG. 16

shows the package


200


retaining and displaying a medicine bottle M.

FIG. 17

shows the package


200


retaining and displaying a football F.




Referring to

FIG. 18

, a further embodiment of a package


300


configured according to principles of the invention is shown manipulated into an open position.

FIG. 19

shows the package


300


manipulated into a closed position. The package


300


has a main compartment


302




a


with a main aperture


304




a


for retaining an object (not shown). The package


300


has a manipulable adjacent compartment


302




b


with an adjacent aperture


304




b


which accommodates the object (not shown). The adjacent compartment


302




b


may maintain the object (not shown) in the adjacent aperture


304




a


when the package


300


is in the closed position.




Referring also to

FIG. 20

, the package


300


includes an inner blank


306


that is folded along fold line


308


, defining interior panels


310




a


and


310




b.


The main interior panel


310




a


provides the main aperture


304




a


and the adjacent interior panel


310




b


provides the adjacent aperture


304




b.


In this embodiment, as shown on

FIG. 18

, the main interior panel


310




a


essentially defines a plane, thus the main aperture


304




a


falls essentially within a plane. As with the foregoing embodiments, the invention does not require that the main interior panel


310




a


or main aperture


304




a


remain in a plane, only that the main aperture


304




a


be configured to retain an object. Also, the principles pertaining to retaining an object with the main compartment


302




a


of the package


300


are substantially similar to the principles discussed for the foregoing embodiments.




In this embodiment of a package


300


, the adjacent interior panel


310




b


defines a plane, thus the adjacent aperture


304




b


falls in a plane. Although different from the foregoing embodiments, the adjacent interior panel


310




b


and adjacent aperture


304




b


of the package


300


are configured to contact or maintain an inserted object when the package


300


is in the closed position, as shown in

FIG. 19

, as with the foregoing embodiments. The principles pertaining to maintaining an object with the adjacent compartments


302




b


of the package


300


are substantially similar to the principles discussed for the foregoing embodiment.




Referring to

FIGS. 18 and 21

, the package


300


includes an exterior blank


324


that is folded along fold lines


326




a


and


b,


defining a plurality of panels


328




a


and


b.


As shown in

FIG. 18

, a set of exterior panels


328




a-b


combines with main interior panel


310




a


and adjacent interior panel


310




b


to define the main compartment


302




a


and adjacent compartment


302




b,


respectively.




The exterior blank


324


mounts onto the interior blank


306


with glued tabs configured to maintain the interior blank


306


in the intended design positions, as shown in

FIGS. 18 and 19

. To that end, the exterior panel


328




a


includes flaps


330




a


that fold along fold lines


332




a


toward the viewer until each flap


330




a


defines essentially a right dihedral angle with the main exterior panel


328




a.


The exterior panel


328




a


is folded along fold line


326




b


toward the viewer until the lateral edges


334




a


abut the exterior panel


328




b.


Abutment of the lateral edges


334




a


and exterior panel


328




b


is not critical to the design, but aids in assembly of the package


300


. Offsetting the lateral edges


334




a


from the fold line


326




b


also is not critical, but aids in assembly of the package


300


.




The exterior panel


328




b


includes flaps


330




b


with tabs


336




b.


Once the exterior panels


328




a


and


b


and flaps


330




a


are positioned, the flaps


330




b


are folded along fold lines


332




b


toward the viewer until each flap


330




b


contacts a flap


330




a


and defines essentially a right dihedral angle with the exterior panel


328




b.


Contact between the flaps


330




a


and


b


is not critical to the invention, but such enhances package integrity. Once the flaps


330




b


are positioned, tabs


336




b


are folded along fold lines


338




b


toward each other and positioned to mate with interior panels


310




a


or


b,


as shown in FIG.


18


.




Once again, all embodiments of the invention are adaptable for protecting various objects during shipment and for retaining and displaying them. For example,

FIG. 22

illustrates the package


300


retaining and displaying a rolled article of clothing S, such as a T-shirt.

FIG. 23

shows the package


300


retaining and displaying an ornament O.





FIG. 24

shows an additional embodiment of a package


400


configured according to principles of the invention, shown manipulated into an open position, retaining and displaying a baseball B along with a baseball trading card T. This embodiment takes advantage of a spacious inner panel


410




a


with an offset main aperture


404




a,


which affords space for displaying indicia or mounting other objects.




The foregoing embodiments of the invention provide a main compartment with an aperture for retaining an object and one or two adjacent compartments with adjacent apertures for maintaining the object when the package is in a closed position. The invention is not limited to one or two adjacent compartments, but may employ any number of compartments.




The invention is not limited to the above, but encompasses all improvements and substitutions consistent with the principles of the invention.



Claims
  • 1. A package having structure configured for concealing an object comprising:a first section including a first panel, which is substantially planar, having a first aperture entirely therein configured to receive the object; and a second section, hinged to said first section, including a second panel and a third panel, having a non-co-planar orientation, and a second aperture, extending in said second panel and said third panel, configured to receive the object.
  • 2. The package of claim 1, wherein said first aperture is configured to resist passage of the object therethrough.
  • 3. The package of claim 1, wherein said first aperture is configured to provide an interference fit with the object.
  • 4. The package of claim 1, wherein, when said panel retains an object and said package is manipulated into said closed position, one or more of said one or more second panels contact(s) the object.
  • 5. The package of claim 4, wherein the object has a surface and, when said second aperture receives the object, said second aperture maintains, but does not retain, the surface of the object.
  • 6. The package of claim 1, wherein the object is selected from a can, a bottle, a ball, a baseball, a football, an article of clothing, an ornament and a card.
  • 7. The package of claim 1, further comprising an object received in said first aperture.
  • 8. The package of claim 7, wherein the object has a first shape and said first aperture has a second shape complementary of the first shape.
  • 9. The package of claim 7, wherein the object has a first shape and said second aperture has a second shape complementary of the first shape.
  • 10. The package of claim 7, wherein said object is selected from a can, a bottle, a ball, a baseball, a football, an article of clothing, an ornament and a card.
  • 11. The package of claim 1, wherein the object has a surface and, when said second aperture receives the object, said second aperture maintains, but does not retain, the surface of the object.
US Referenced Citations (15)
Number Name Date Kind
D. 141077 Sawyer May 1945
611063 Davis Sep 1898
1171083 Bailey Feb 1916
1210008 Singer et al. Dec 1916
2019414 Isacson Oct 1935
2126407 Payne et al. Aug 1938
2296389 Levkoff Sep 1942
2324436 Snyder Jul 1943
2706037 Feigelman Apr 1955
2980244 Gendre Apr 1961
3123204 Baker et al. Mar 1964
3357543 Taggart Dec 1967
4462178 Freeman Jul 1984
4779726 Pratt Oct 1988
5322210 Chila et al. Jun 1994