Siebolt Hettinga

Person

Des Moines, IA, US

People

Patents Grantslast 30 patents

Information Patent Grant
Plastic article of varying density
- Patent number 6,217,973
- Issue date Apr 17, 2001
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Heat laminated fabric hinge and method of making same
- Patent number 6,149,998
- Issue date Nov 21, 2000
- Siebolt Hettinga
- E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
Information Patent Grant
Method of injection molding an article with a cellular density dist...
- Patent number 6,146,562
- Issue date Nov 14, 2000
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Bottle closure
- Patent number 6,139,934
- Issue date Oct 31, 2000
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Method for controlling skin thickness of plastic article made with...
- Patent number 6,129,870
- Issue date Oct 10, 2000
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Method of making a multiple-layer article having a plastic member w...
- Patent number 6,071,461
- Issue date Jun 6, 2000
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Low pressure method and apparatus for injection molding a plastic a...
- Patent number 6,060,005
- Issue date May 9, 2000
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Method and apparatus for molding a plastic article including inject...
- Patent number 6,056,902
- Issue date May 2, 2000
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Method for forming an angled plastic article of varying density
- Patent number 5,972,259
- Issue date Oct 26, 1999
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Injection molded plastic article and method of molding same
- Patent number 5,968,440
- Issue date Oct 19, 1999
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Extruded-in fabric hinge and method of making same
- Patent number 5,945,053
- Issue date Aug 31, 1999
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Method of molding a plastic article including injecting based upon...
- Patent number 5,902,525
- Issue date May 11, 1999
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Article of manufacture having computer readable program code for mo...
- Patent number 5,898,591
- Issue date Apr 27, 1999
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Low pressure method for injection molding a plastic article
- Patent number 5,853,630
- Issue date Dec 29, 1998
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Seat unit and cushion
- Patent number 5,788,332
- Issue date Aug 4, 1998
- Siebolt Hettinga
- B60 - VEHICLES IN GENERAL
Information Patent Grant
Apparatus for family mold sequential molding
- Patent number 5,773,038
- Issue date Jun 30, 1998
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Process for making molded-in lamina hinge
- Patent number 5,762,852
- Issue date Jun 9, 1998
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Metal reinforced plastic article and method of forming same
- Patent number 5,750,001
- Issue date May 12, 1998
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Self-contained molding apparatus and method for clamping the mold u...
- Patent number 5,665,405
- Issue date Sep 9, 1997
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Multi-clamp mold and method for clamping an injection mold assembly
- Patent number 5,618,487
- Issue date Apr 8, 1997
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Method of compressing and cooling plastic purge as it emanates from...
- Patent number 5,496,508
- Issue date Mar 5, 1996
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Method for molding a plastic article of varied density
- Patent number 5,437,823
- Issue date Aug 1, 1995
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Method for injection molding a plastic part using a film gate
- Patent number 5,422,059
- Issue date Jun 6, 1995
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Flow regulating assembly for a plastic injection machine
- Patent number 5,380,186
- Issue date Jan 10, 1995
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Process for making molded-in lamina hinge
- Patent number 5,336,460
- Issue date Aug 9, 1994
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Method of molding a vehicle lamp assembly
- Patent number 5,275,764
- Issue date Jan 4, 1994
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Method of injection molding a flat deformable laminate
- Patent number 5,151,237
- Issue date Sep 29, 1992
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Process for injection molding a hollow plastic article
- Patent number 5,139,714
- Issue date Aug 18, 1992
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Method for molding a laminate
- Patent number 5,110,532
- Issue date May 5, 1992
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Method of molding a composite article
- Patent number 4,743,323
- Issue date May 10, 1988
- Siebolt Hettinga
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

Siebolt Hettinga

Person

Patents Grantslast 30 patents

Plastic article of varying density

Heat laminated fabric hinge and method of making same

Method of injection molding an article with a cellular density dist...

Bottle closure

Method for controlling skin thickness of plastic article made with...

Method of making a multiple-layer article having a plastic member w...

Low pressure method and apparatus for injection molding a plastic a...

Method and apparatus for molding a plastic article including inject...

Method for forming an angled plastic article of varying density

Injection molded plastic article and method of molding same

Extruded-in fabric hinge and method of making same

Method of molding a plastic article including injecting based upon...

Article of manufacture having computer readable program code for mo...

Low pressure method for injection molding a plastic article

Seat unit and cushion

Apparatus for family mold sequential molding

Process for making molded-in lamina hinge

Metal reinforced plastic article and method of forming same

Self-contained molding apparatus and method for clamping the mold u...

Multi-clamp mold and method for clamping an injection mold assembly

Method of compressing and cooling plastic purge as it emanates from...

Method for molding a plastic article of varied density

Method for injection molding a plastic part using a film gate

Flow regulating assembly for a plastic injection machine

Process for making molded-in lamina hinge

Method of molding a vehicle lamp assembly

Method of injection molding a flat deformable laminate

Process for injection molding a hollow plastic article

Method for molding a laminate

Method of molding a composite article