Inventor

Siebolt Hettinga

Inventor

Des Moines, IA, US

Overview

38→

Patents

1978–2001

Patent span

Performing operations

Primary field (CPC B)

Patents· 38 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

B29Cprimary

B29CShaping or joining of plastics46%

Y10TTechnical subjects covered by former us classification11%

B29LIndexing scheme associated with subclass b29c, relating to particular articles8%

B29KIndexing scheme associated with subclasses b29b, b29c or b29d, relating to moulding materials or to materials for moulds, reinforcements, fillers or preformed parts, e.g. inserts4%

B32BLayered products, i.e. products built-up of strata of flat or non-flat, e.g. cellular or honeycomb, form3%

E05DHinges or suspension devices for doors, windows or wings3%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests3%

B22DCasting of metals1%

B23DPlaning1%

B23QDetails, components, or accessories for machine tools, e.g. arrangements for copying or controlling1%

PatentTitleYear

6,217,973'Plastic article of varying density'2001 6,149,998'Heat laminated fabric hinge and method of making same'2000 6,146,562'Method of injection molding an article with a cellular density distribution which gradually varies between a high density cellular exterior and a low density cellular interior'2000 6,139,934'Bottle closure'2000 6,129,870'Method for controlling skin thickness of plastic article made with controlled density'2000 6,071,461'Method of making a multiple-layer article having a plastic member with a surface application material effectively bonded thereto'2000 6,060,005'Low pressure method and apparatus for injection molding a plastic article'2000 6,056,902'Method and apparatus for molding a plastic article including injecting based upon a pressure-dominated control algorithm after detecting an indicia of a decrease in the surface area of the melt front'2000 5,972,259'Method for forming an angled plastic article of varying density'1999 5,968,440'Injection molded plastic article and method of molding same'1999 5,945,053'Extruded-in fabric hinge and method of making same'1999 5,902,525'Method of molding a plastic article including injecting based upon a pressure-dominated control algorithm after detecting an indicia of a decrease in the surface area of the melt front'1999 5,898,591'Article of manufacture having computer readable program code for molding an article and method of molding an article by providing computer readable program code'1999 5,853,630'Low pressure method for injection molding a plastic article'1998 5,788,332'Seat unit and cushion'1998 5,773,038'Apparatus for family mold sequential molding'1998 5,762,852'Process for making molded-in lamina hinge'1998 5,750,001'Metal reinforced plastic article and method of forming same'1998 5,665,405'Self-contained molding apparatus and method for clamping the mold unit of an injection mold apparatus'1997 5,618,487'Multi-clamp mold and method for clamping an injection mold assembly'1997 5,496,508'Method of compressing and cooling plastic purge as it emanates from a plastic injection molding machine'1996 5,437,823'Method for molding a plastic article of varied density'1995 5,422,059'Method for injection molding a plastic part using a film gate'1995 5,380,186'Flow regulating assembly for a plastic injection machine'1995 5,336,460'Process for making molded-in lamina hinge'1994 5,275,764'Method of molding a vehicle lamp assembly'1994 5,151,237'Method of injection molding a flat deformable laminate'1992 5,139,714'Process for injection molding a hollow plastic article'1992 5,110,532'Method for molding a laminate'1992 4,743,323'Method of molding a composite article'1988 4,613,475'Clamping structure and method for clamping the mold unit of a mold injection apparatus'1986 D0282847'Tilt and rotate base for a display monitor'1986 4,397,806'Method and apparatus for mold injection'1983 4,350,193'Power tool accessory table'1982 4,307,057'Method for aligning an injection mold with a nozzle at the mold injection station'1981 4,286,731'Soap leaf sheet dispenser'1981 4,125,490'Method of forming dimensionally stable foamed articles of polyvinyl aromatic resins and resultant product'1978 D0247877'Square'1978

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1978–1998Patents assigned to HETTINGA SIEBOLT (12)· patent assignee history

1978Patents assigned to FOAM MOLDING CORP OF IOWA (1)· patent assignee history

1978–2001Based in Des Moines, IA, US· patent location history

1978–1982Based in Adel, IA, US· patent location history

1981Patents assigned to PARACHEM CORP (1)· patent assignee history

1982Patents assigned to CENTRAL QUALITY IND INC (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
HETTINGA SIEBOLTself	12	1978–1998
CENTRAL QUALITY IND INC	1	1982
FOAM MOLDING CORP OF IOWA	1	1978
PARACHEM CORP	1	1981

Locations

Location	Patents	Span
Des Moines, IA, US	36	1978–2001
Adel, IA, US	2	1978–1982