Inventor

Frank E. Critchfield

Inventor

South Charleston, WV, US

Overview

22→

Patents

1976–2000

Patent span

Chemistry

Primary field (CPC C)

Patents· 22 as inventor

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

C08Gprimary

C08GMacromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds45%

C08FMacromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds21%

C08JWorking-up14%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests10%

C08LCompositions of macromolecular compounds7%

B29BPreparation or pretreatment of the material to be shaped2%

PatentTitleYear

6,127,443'Energy management polyurethane rigid foams with high recovery'2000 5,718,856'Process for manufacturing foam with improved wet set properties'1998 5,668,191'One-shot cold molded flexible polyurethane foam from low primary hydroxyl polyols and process for the preparation thereof'1997 5,549,841'Process for manufacturing foam with improved wet set properties'1996 5,496,894'Low viscosity polymer polyols with improved dispersion stability'1996 5,395,860'Flexible polyurethane foams using chlorinated alkanes'1995 5,364,906'Low viscosity polymer polyols with improved dispersion stability'1994 5,084,486'Reactive feed stream to replace inert blowing agent feed stream in a polyurethane foam process'1992 4,902,723'Process for producing flexible polyurethane foam using hexahydro-s-triazine catalysts'1990 4,883,825'Process for the manufacture of low density, flexible polyurethane foams'1989 4,814,359'Process for producing flexible polyurethane foam using hexahydro-S-triazine catalysts'1989 4,797,501'Silicone-based stabilizers useful in the preparation of improved polyurethane foams'1989 RE032733'Polymer/polyol compositions having improved combustion resistance'1988 4,652,589'Polymer/polyols having improved combustion resistance and intrinsic viscosity, methods of making same and polyurethanes prepared therefrom'1987 4,463,107'Polymer/polyol compositions having improved combustion resistance'1984 4,312,973'Polyurethane elastomers prepared from polyol or polymer/polyol-chain extender mixtures'1982 4,283,500'Polymer/polyisocyanates'1981 4,226,756'Mixtures of extenders and polyols or polymer/polyols useful in polyurethane production'1980 4,190,711'Thermoplastic polyether polyurethane elastomers'1980 4,125,505'Polymer/polyols from high ethylene oxide content polyols'1978 4,119,584'Phenolic foam modified with phosphorus-containing isocyanate-terminated prepolymers'1978 4,000,218'Process for preparing particulate polyurethane polymers and the polymers derived therefrom'1976

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1976–1989Patents assigned to UNION CARBIDE CORP (11)· patent assignee history

1976–2000Based in South Charleston, WV, US· patent location history

1989–1992Patents assigned to UNION CARBIDE CHEM PLASTIC (3)· patent assignee history

1994–1998Patents assigned to ARCO CHEM TECH (6)· patent assignee history

2000Patents assigned to BAYER ANTWERP N V (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
UNION CARBIDE CORP	11	1976–1989
ARCO CHEM TECH	6	1994–1998
UNION CARBIDE CHEM PLASTIC	3	1989–1992
BAYER ANTWERP N V	1	2000

Locations

Location	Patents	Span
South Charleston, WV, US	22	1976–2000