Information
-
Patent Grant
-
6305577
-
Patent Number
6,305,577
-
Date Filed
Friday, September 13, 199133 years ago
-
Date Issued
Tuesday, October 23, 200122 years ago
-
Inventors
-
Original Assignees
-
Examiners
-
CPC
-
US Classifications
Field of Search
US
- 222 95
- 222 94
- 222 105
- 222 107
- 222 209
- 222 212
- 222 213
- 222 3865
- 222 490
- 222 183
- 222 494
-
International Classifications
-
Abstract
A squeeze dispenser package comprising a container having a compressible portion and a hanger and pouch assembly of plastic material, suspended in the container. The hanger has an upper portion having an opening and a flexible film pouch having an opening is bonded to the opening in the hanger and has portions thereof bonded to the hanger. The hanger has a lower flexible portion comprising spaced flexible walls. In one form, a removable head is mounted on the container and overlies the hanger and pouch assembly. The head includes a nozzle having an opening overlying the opening in the pouch and an atmospheric valve is provided for equalizing the pressure after the compressible portion of the container has been released and the hanger and pouch assembly returns to its original position.
Description
BACKGROUND AND SUMMARY OF THE INVENTION
It has heretofore been suggested that dispensers for viscous products comprise a container which contains the product and which is squeezed to dispense the product. In one type of such dispenser, a bag or pouch containing the viscous product is provided within a container so that when the compressible sidewall of the container is squeezed, the product is dispensed through a opening or nozzle. In U.S. Pat. No. 2,608,320 issued Aug. 26, 1952 there is shown a dispenser which has a cartridge as a refill unit which contains the viscous product. The cartridge has a rigid upper portion and a flexible lower portion and is suspended in a container or holder and a removable cap is provided on the container. When the flexible portion of the container is squeezed, the viscous product is dispensed through an opening in a disk on the upper end of the cartridge and an opening in the cap. An atmospheric valve is provided on the lower end of the container which closes upon squeezing of the flexible portion of the container. Other similar dispensers are shown in U.S. Pat. Nos. 2,743,038 (1956) and 2,804,995 (1957) which have an opening that is covered by the finger of the user rather than an atmospheric valve. Dispensing closures with a valve in the dispensing portion have also been suggested in the prior art as shown in U.S. Pat. Nos. 3,592,365 (1971), and 3,669,223 (1972). Squeeze pump packages are shown in U.S. Pat. Nos. 4,842,165,4,098,434, 4,469,250, 4,760,937 and 4,909,416.
Among the objectives of the present invention are to provides a squeeze dispenser package which comprises a novel hanger and pouch assembly; wherein the package can be filled from the top; wherein the pouch is fully preformed before filling; wherein the package can be refilled by replacing the hanger and pouch assembly; wherein the package can be readily manufactured in high production; and which efficiently dispenses the viscous product.
In accordance with the invention, a squeeze dispenser package comprising a container having a compressible portion and a hanger and pouch assembly of plastic material, suspended in the container. The hanger has an upper portion having an opening and a flexible film pouch having an opening is bonded to the opening in the hanger and has portions thereof bonded to the hanger. The hanger has a lower flexible portion comprising spaced flexible walls. In one form, a removable head is mounted on the container and overlies the hanger and pouch assembly. The head includes a nozzle having an opening overlying the opening in the pouch and an atmospheric valve is provided for equalizing the pressure after the compressible portion of the container has been released and the hanger and pouch assembly returns to its original position.
DESCRIPTION OF THE DRAWINGS
FIG. 1
is a sectional elevational view of a squeeze dispenser embodying the invention.
FIG. 2
is a part sectional side elevational view of the dispenser package shown in FIG.
1
.
FIG. 3
is a top plan view.
FIG. 4
is a sectional view taken along the line
4
—
4
in
FIG. 1
with the pouch removed.
FIG. 5
is a vertical sectional view of a hanger and pouch assembly used in the package.
FIG. 6
is a fragmentary sectional exploded view of portions of the package.
FIG. 7
is a fragmentary sectional view on an enlarged scale of a portion of the package shown in FIG.
1
.
FIG. 8
is an elevational view of a part utilized in some of the packages.
FIG. 9
is a plan view of the part shown in FIG.
8
.
FIG. 10
is a fragmentary sectional view on an enlarged scale taken along the line
10
—
10
in FIG.
9
.
FIG. 11
is a fragmentary part sectional elevational view of a portion of the package shown in
FIGS. 1-7
.
FIG. 12
is a fragmentary part sectional side elevational view of the portion of the package shown in FIG.
11
.
FIG. 13
is a bottom plan view of the head of the package shown in
FIGS. 11 and 12
.
FIG. 14
is a plan view of the upper end of the container of the package shown in
FIGS. 11 and 12
.
FIGS. 15-18
are views similar to
FIGS. 11-14
of a modified form of package.
FIG. 19
is a part sectional elevational view of a modified hanger and pouch assembly.
FIG. 20
is a sectional elevational view of a modified form of package.
FIG. 21
is a part sectional side elevational view of the package shown in FIG.
9
.
FIG. 22
is a sectional view on an enlarged scale of a portion of the package shown in FIG.
20
.
FIG. 22A
is a sectional view taken along the line
22
A—
22
A in FIG.
22
.
FIG. 23
is a sectional elevational view of another modified form of package.
FIG. 24
is a fragmentary sectional elevational view of a further modified form of package.
FIG. 25
is a fragmentary part sectional side elevational view of the package shown in FIG.
24
.
FIG. 26
is a fragmentary vertical sectional elevational view of another modified form of package.
FIG. 27
is a fragmentary sectional view of a further modified form of package.
DESCRIPTION
Referring to
FIGS. 1-10
a squeeze dispensing package embodying the invention comprises a container
30
, a hanger and pouch assembly
31
, a dispensing nozzle
32
, a check valve
33
adjacent the hanger and pouch assembly
31
and an atmospheric valve
34
.
In this form, the container
30
includes a body portion
35
and a removable head
36
. The body portion
30
is generally oval in cross section and has a closed bottom wall
37
and an open upper end. The head
36
includes the nozzle
32
as an integral part thereof and a generally oval shoulder portion
38
includes a peripheral skirt
39
, which interengages the upper end of the body portion
35
as presently described.
The hanger and pouch assembly
31
comprises a hanger
40
, a pouch
45
and a ferrule
50
. The hanger
40
includes a relatively rigid upper portion including a cylindrical portion
41
, oval shoulder portion
42
and oval skirt portion
43
. The hanger
40
further includes a relatively flexible substantially imperforate lower portion
44
which is generally oval in cross section.
The pouch
45
of the hanger and pouch assembly
31
comprises flexible film which is suspended and extends substantially beyond the lower portion
44
of the hanger.
The bottom
46
of the pouch is closed and the upper portion of the pouch is bonded to the inner surface of the flexible lower portion
44
of the hanger
40
at circumferentially spaced and vertically spaced areas so that the upper portion of the pouch
45
will be moved by the flexing of the lower portion
44
of the hanger. Preferably, the pouch
45
is bonded to the flexible portion
44
by heat sealing at vertically spaced areas
47
,
48
along the long and short sides.
The pouch
45
may be sealed to the cylindrical opening
41
of hanger
40
directly or indirectly. As shown in
FIGS. 1
,
2
and
5
-
7
, the open upper end of the pouch
45
is sealed by heat bonding to the ferrule
50
which is then snapped into the opening defined by the cylindrical portion
41
.
Referring to
FIGS. 8-10
, the ferrule
50
includes a central cylindrical body portion
51
, an upper flange
52
and a wider lower flange
53
. The upper end of the pouch
45
is sealed to the lower part of the cylindrical body portion
53
, as shown in broken lines in FIG.
10
.
Referring to
FIGS. 6 and 7
, the head
36
includes an integral nozzle
32
which has an external thread
54
for threading of a closure
55
having an internal thread
56
thereon so that the base wall
57
of the closure
55
engages and encloses the open end of the nozzle
32
. The base wall
57
of closure
55
preferably includes an annular wall
58
that has a tapered inner surface sealingly engaging the periphery of nozzle
32
.
The head
36
further includes an axial portion
59
that extends into the open end of the ferrule
50
and sealingly engages the open end of the pouch
55
by cylindrical to cylindrical surface contact.
The check valve
33
preferably comprises a flap type valve
60
and a valve seat
61
against which the flap valve seats. The assembled valve
33
is snapped into position between a shoulder
62
on the head
36
, an annular bead
63
on the axial portion
59
.
The outer surface of the relatively rigid portion
43
of the hanger
40
is formed with axially spaced annular ribs
64
that provide an interference fit with the inner surface of the upper end of the body portion
35
of the container. The skirt
39
of the head
36
engages a continuous bead
65
that maintains the interference fit. The body portion
35
includes a flange
66
spaced axially below bead
65
to prevent the entry of diverse particles and the like.
The hanger
40
includes an annular flange
67
that engages the upper end of the body portion
35
.
The body
35
of the container is molded with a gate spider
67
a
in the bottom wall defining a plurality of circumferentially spaced openings for the passage of air. The atmospheric valve
34
comprises a film flap valve
68
which is bonded, preferably by heat sealing, to a disk
68
a
which, in turn, is bonded to the lower wall of the container. The disk
68
a
has openings
69
underlying the film flap valve
68
such that in operation of the squeeze dispenser package, the film flap valve
68
may open and equalize the pressure surrounding the pouch
55
. Alternatively, the atmospheric or equalizing valve could be mounted elsewhere on the package.
Referring to
FIGS. 11-14
, provision is made for retaining the head
36
on the body portion while permitting the head
36
to be removed by a relative twisting between the head
36
and body portion
35
. The inner surface of the skirt
39
is formed with bead segments
70
along the long sides of the skirt. The head
36
is applied to the body portion
35
by snapping the head in place. The rigid skirt
39
of the head
36
provides intimate contact with the retaining bead
65
on the body portion providing support for the hanger and bag assembly
31
. When it is desired to remove and replace the hanger and bag assembly
31
, the head is grasped with one hand and the body portion is grasped with the other hand and are twisted relative to one another. This action causes the bead segments
70
and bead
65
to cam out of engagement such that the head is removed.
In the form shown in
FIGS. 15-18
, the bead segments
65
a
are provided on the body portion
35
a
of the container and the continuous bead
70
a
is provided on the inner surface of the skirt of the head
36
a.
The squeeze dispensing package thus provides seals as required for proper functioning as follows:
1. Between the head
36
and ferrule
50
and pouch
45
thereon.
2. Interference fit between hanger
40
and ferrule
50
.
3. Interference fit between the hanger
40
and body portion
35
.
The body
35
and the hanger
40
are made of a plastic material such that the side walls of the body
35
and the side walls of the hanger
40
are easily squeezable and yet are resilient enough and have sufficient elastic memory to return to normal when the squeeze is released.
The head
36
, check valve
33
and cap
55
are preferably made of plastic such as polypropylene. The body
35
and the atmospheric or equalizer valve
34
are preferably made of plastic such as linear low density polyethylene. The hanger
40
and ferrule
50
are also preferably molded of plastic such as linear low density polyethylene.
As indicated, the cross section of body
35
is preferably oval to facilitate grasping and squeezing the body
35
. The body
35
is sufficiently thin that it will flex under the squeezing pressure of a user. The flexible portion
44
of the hanger
40
has a configuration such that a space exists between the outer surface of the flexible portion
44
and the inner surface of the wall of the body portion
35
of the container. Thus, the flexible portion
44
of the hanger
40
will flex independently of the body
35
.
The pouch
45
is made of a single layer or multilayer plastic film which will provide the desired protection for the product to be dispensed.
The design permits easy filling and assembly of the components. For example, the hanger and pouch assembly may be inserted into the body and filled with product through the ferrule
50
. Air displaced during the filling process would be vented through the gate spider
67
a
. The head assembly
36
is then snapped onto the top of the body
35
, with the internal plug seal
59
entering the ferrule
50
, sealing the contents of the hanger and pouch assembly
31
. The atmospheric valve
34
is bonded in place in the bottom wall
37
. Alternatively, the hanger and pouch assembly
31
may be filled before insertion into the body
35
. Labeling and protective wrapping operations would follow.
To dispense viscous product, the closure
55
must be removed. Then the front and back panels of the body
35
may be pressed inwardly. This action causes the film flap valve
68
of the atmospheric valve
34
to seat firmly against the ports
69
. Continuous pressure against the panels will force the product through the valve
33
and outwardly through the nozzle
32
. When external pressure has been released, the product will start to return to the inside of the pouch
45
. This causes the valve
33
to close on the valve seat, stopping the return flow. Reduced internal pressure then causes the atmospheric valve
34
to lift away from the ports, admitting air into the space between the body
35
and the pouch
45
. This causes the bottom of the pouch
45
to rise. Repeated dispensing of product continues to cause the bottom of the pouch
45
to rise until the product has been exhausted. At this point, the pouch
45
will have been inverted entirely within the hanger
40
.
Thus, when the container
35
is squeezed, the hanger and pouch are also squeezed and the contents are dispensed. When the squeeze forces are removed, the container walls return to their original configuration. The reduced pressure between the pouch
45
and container walls
35
provides a force tending to return the pouch to its original configuration, assisted in part by the elastic memory of the hanger
41
. At the same time, the reduced pressure in the contents of the pouch
45
closes the valve
33
in the nozzle
32
but this is not instantaneous.
The outer wall
35
of the package does not instantaneously return the pouch
55
to its substantially undeformed cross-section upon removal of opposed squeezing forces. The reduced pressure between the outer wall and the flexible pouch
55
provides a force tending to return the pouch to its original configuration, assisted in part by the elastic memory of the hanger. At the same time, the reduced pressure in the contents of the pouch
55
closes the valve
33
in the nozzle but this is not instantaneous.
The dispenser may be refilled by:
1. Removing the head assembly
36
from the body
35
.
2. Lifting the empty hanger and pouch assembly
31
from the body
35
.
3. Lowering a filled hanger and pouch assembly
31
into the body
35
.
4. Removing any seal from top of the hanger and pouch assembly
31
.
5. Firmly snapping the head
36
onto the top of the body
35
.
In the form of hanger and pouch assembly shown in
FIG. 19
, the hanger
40
a
is modified to include a plurality of circumferentially spaced elongated openings
75
in order to provide greater flexibility in the side wall. In all other respects, the package is the same as that of
FIGS. 1-10
.
In the form of squeeze package shown in
FIGS. 20-22A
, the container
80
is formed without a bottom wall which is bonded to the container
80
so that the hanger and pouch assembly
82
can be inserted from the bottom of the container
80
. After the insertion of the hanger and pouch assembly
82
, a separate bottom wall
81
is bonded to the container
80
. The head
83
is formed as an integral part of the container
80
. In this form, the upper end of the pouch
84
is bonded directly to the opening in the hanger
85
without the use of a ferrule. The hanger
85
includes an integral cylindrical portion
86
into which the pouch extends and is bonded by heat sealing. An integral axial extension
87
on the hanger
85
is provided into which the nozzle
88
extends.
Axially spaced shoulders
89
,
90
on the nozzle snap over a portion
91
of reduced diameter on the axial projection
87
.
The container
80
has its upper end formed with a cylindrical axial wall
92
. The hanger
85
includes a flange
93
and a radial wall
94
into which wall
93
of the container extends to support the hanger and pouch assembly
82
.
The axial extension
87
is formed with external threads
95
for receiving the internal threads
96
on a closure
97
. In order to prevent relative rotation and insure proper orientation between the hanger
85
and the container
80
axially extending teeth
98
,
99
are provided between the wall
86
and wall
92
as shown in FIG.
22
A.
In all other respects the squeeze dispensing package is constructed and functions like that shown in
FIGS. 1-10
.
In the form of squeeze package shown in
FIG. 23
, the construction is similar to that shown in
FIGS. 20 and 21
except that a ferrule
50
is provided to which the open end of the pouch
84
is heat bonded.
In the form of dispensing package shown in
FIGS. 24 and 25
, the package is generally identical to that shown in
FIGS. 1-14
, except that a vertical tapered slit
100
is provided along the narrow sides of the flexible portion of the hanger
40
b
to permit further flexing of the skirt of the hanger.
In the form of the dispensing package shown in
FIG. 26
, the shoulder of a hanger
40
c
is formed with an opening
101
that permits venting of the between the pouch
45
and hanger
40
during the time that the pouch is being filled with product. This opening comprises an annular portion
102
that is engaged by the shoulder
38
on the hanger
40
c
to seal the opening
101
when the head is applied.
The form of squeeze dispensing package shown in
FIG. 27
is like that shown in
FIGS. 1-10
except that the pouch
45
is bonded by heat sealing to the exterior of the ferrule
50
. In this form, the seal between the head
36
and hanger
40
is provided by the interference fit of axial extension
59
and the inside of the ferrule
50
.
It can thus be seen that there has been provided a squeeze dispenser package which includes a novel hanger and pouch assembly; wherein the hanger and pouch assembly can be replaced; wherein the package can be readily manufactured in high production; and which efficiently dispenses the viscous product.
Claims
- 1. A squeeze pump package comprisinga plastic container having opposed compressible portions, a hanger and pouch assembly comprising a hanger and a pouch, said hanger being made of plastic material, means for suspending said hanger in said container, said hanger comprising a relatively rigid upper portion having an opening, said hanger having a lower portion comprising spaced flexible walls portions, said pouch comprising a plastic film pouch having an opening bonded adjacent the opening in the hanger and having portions thereof bonded of said flexible portions to said hanger, said film pouch comprising a sealed flexible lower portion extending beyond the lower portion of said hanger, means for providing a nozzle having an opening overlying the opening in the pouch, a check valve, means for mounting said check valve adjacent the opening in the hanger, and an atmospheric valve on said package for equalizing the pressure after the compressible portion of the container has been released and the hanger returns to its original position.
- 2. The squeeze dispenser package set forth in claim 1 wherein said pouch is bonded to an interior surface of the flexible portions of said hanger.
- 3. The squeeze dispenser package set forth in claim 2 wherein said portions of said pouch bonded to said hanger comprise axially and transversely spaced portions.
- 4. The squeeze dispenser package set forth in claim 2 wherein said portions of said pouch bonded to said hanger extend transversely.
- 5. The squeeze dispenser package set forth in claim 1 including a ferrule insertable into said opening in said hanger, said pouch being bonded to said ferrule.
- 6. The squeeze dispenser package set forth in claim 5 wherein said pouch is heat sealed to an exterior of said ferrule.
- 7. The squeeze dispenser package set forth in claim 5 wherein said pouch is heat sealed to an interior of said ferrule.
- 8. The squeeze dispenser package set forth in claim 1 wherein said means for suspending said hanger within said container comprises a removable head on said container, interengaging means between said hanger and said container and means for removably mounting said head on said container to hold said hanger and pouch assembly in position in said container.
- 9. The squeeze dispenser package set forth in claim 8 wherein said means providing a nozzle comprises a nozzle integral with said head.
- 10. The squeeze dispenser package set forth in claim 9 wherein said means for mounting said check valve comprises interengaging means between said hanger and said check valve.
- 11. The squeeze dispenser package set forth in claim 10 wherein said head includes a portion interengaging said hanger to form a seal with the opening of said pouch.
- 12. The squeeze dispenser package set forth in claim 11 wherein said pouch is bonded to an interior surface of the flexible portions of said hanger.
- 13. The squeeze dispenser package set forth in claim 12 wherein said portions of said pouch bonded to said hanger comprise axially and transversely spaced portions.
- 14. The squeeze dispenser package set forth in claim 13 wherein said portions of said pouch bonded to said hanger extend transversely.
- 15. The squeeze dispenser package set forth in claim 11 including a ferrule insertable into said opening in said hanger, said pouch being bonded to said ferrule.
- 16. The squeeze dispenser package set forth in claim 15 wherein said pouch is heat sealed to an exterior of said ferrule.
- 17. The squeeze dispenser package set forth in claim 15 wherein said pouch is heat sealed to an interior of said ferrule.
- 18. The squeeze dispenser package set forth in claim 8 wherein a body portion of said container has an upper end, said hanger including a flange engaging the upper end of said body portion of said container.
- 19. The squeeze dispenser package set forth in claim 18 wherein said interengaging means between said hanger and said container comprises said relatively rigid upper portion of said hanger having a portion extending into the upper end of said container and having an interference fit with said container.
- 20. The squeeze dispenser package set forth in claim 8 wherein said head and container are substantially oval, said means removably mounting said head and said container comprises an annular bead on one of said head and said container and an interengaging segment on long side of the other of said head and said container.
- 21. The squeeze dispenser package set forth in claim 20 wherein said annular bead is on said container and said segments is on said head.
- 22. The squeeze dispenser package set forth in claim 20 wherein said annular bead is on said head and said segments is on said container.
- 23. The squeeze dispenser package set forth in claim 8 wherein said hanger has a shoulder with a venting opening therein; said head having a portion closing said opening.
- 24. The squeeze dispenser package set forth in claim 1 wherein said means suspending said hanger and pouch assembly in said container comprises an annular portion on said hanger, an annular portion on an upper end of said container and interengaging means between said annular portions.
- 25. The squeeze dispenser package set forth in claim 24 wherein said means for providing a nozzle comprises a nozzle and interengaging means between said nozzle and said hanger for supporting said nozzle on said hanger.
- 26. The squeeze dispenser package set forth in claim 24 wherein said pouch is bonded to an interior surface of the flexible portions of said hanger.
- 27. The squeeze dispenser package set forth in claim 26 wherein said portions of said pouch bonded to said hanger comprise axially and transversely spaced portions.
- 28. The squeeze dispenser package set forth in claim 26 wherein said portions of said pouch bonded to said hanger extend transversely.
- 29. The squeeze dispenser package set forth in claim 24 including a ferrule insertable into said opening in said hanger, said pouch being bonded to said ferrule.
- 30. The squeeze dispenser package set forth in claim 29 wherein said pouch is heat sealed to an exterior of said ferrule.
- 31. The squeeze dispenser package set forth in claim 29 wherein said pouch is heat sealed to an interior of said ferrule.
- 32. A hanger and pouch assembly for use in a squeeze pump package comprising a plastic container having opposed compressible portions, comprisinga hanger and a pouch, said hanger being made of plastic material, said hanger including means for suspending said hanger in a container, said hanger comprising a relatively rigid upper portion having an opening, said hanger having a lower portion comprising spaced flexible walls, said pouch comprising a plastic film pouch having an opening bonded adjacent the opening to the opening in the hanger and having portions thereof bonded to said flexible portions of said hanger, said film pouch comprising a sealed flexible lower portion extending beyond the lower portion of said hanger.
- 33. The hanger and pouch assembly set forth in claim 32 wherein said pouch is bonded to an interior surface of the flexible portions of said hanger.
- 34. The hanger and pouch assembly set forth in claim 33 wherein said portions of said pouch bonded to said hanger comprise axially and transversely spaced portions.
- 35. The hanger and pouch assembly set forth in claim 33 wherein said portions of said pouch bonded to said hanger extend transversely.
- 36. The hanger and pouch assembly set forth in claim 32 including a ferrule insertable into said opening in said hanger, said pouch being bonded to said ferrule.
- 37. The hanger and pouch assembly set forth in claim 36 wherein said pouch is heat sealed to an exterior of said ferrule.
- 38. The hanger and pouch assembly set forth in claim 36 wherein said pouch is heat sealed to an interior of said ferrule.
- 39. The hanger and pouch assembly set forth in claim 32 wherein said means for suspending said hanger and pouch assembly within a container comprises a removable head adapted to be mounted on a container to hold said hanger and pouch assembly in position in a container.
- 40. The hanger and pouch assembly set forth in claim 32 wherein said hanger includes a flange engaging the upper end of a body portion of a container.
- 41. The hanger and pouch assembly set forth in claim 40 wherein said relatively rigid upper portion includes a portion adapted to extend into an upper end of a container and have an interference fit with a container.
- 42. The hanger and pouch assembly set forth in claim 32 wherein said hanger has a shoulder with a venting opening therein.
- 43. An inner receptacle for containing a viscous product and for use with a squeeze container which is resiliently deformable substantially along its entire longitudinal length and has an outlet opening, said inner receptacle comprising:an upper portion and a lower portion for being arranged in succession along the longitudinal length of the squeeze container; said upper portion including an upper end having means for suspending the inner receptacle within the squeeze container and a discharge opening for being substantially aligned with said outlet opening; said lower portion including a flexible liner for containing said viscous product; said flexible liner heaving an open upper part, a sealed lower end, and an original filled shape; said upper portion further including a resiliently deformable support means disposed proximate said outlet opening for radially supporting the upper part of said flexible liner, for maintaining the upper part of said flexible liner in substantially its original filled shape between dispensing operations, and for forcing said flexible liner to controlledly invert inside the upper portion during a dispensing operation thus displacing the viscous product within the flexible liner toward the discharge opening and permitting substantially all of the viscous product to be dispensed; said support means having an original unstressed shape and being resiliently deformed during a dispensing operation when a squeeze force is applied to said squeeze container; and said support means having memory to allow it to return to its original unstressed shape after the squeeze force is removed from the container.
US Referenced Citations (19)
Foreign Referenced Citations (2)
Number |
Date |
Country |
2081244 |
Dec 1971 |
FR |
2184491 |
Jun 1987 |
GB |