Inventor · disambiguated record
Frank E. Critchfield
Also filed as: CRITCHFIELD FRANK E · CRITCHFIELD FRANK EDWARD · ZDRAHALA RICHARD J
21 granted patents·732 citations·filing 1975–1998
97Inventor score
Top patents by PatentIndex Score
21 records- 0197US4190711AThermoplastic polyether polyurethane elastomersUNION CARBIDE CORP·Filed 1977·Granted Feb 26, 1980·107 cites·36 claims
- 0294US4125505APolymer/polyols from high ethylene oxide content polyolsUNION CARBIDE CORP·Filed 1976·Granted Nov 14, 1978·68 cites·10 claims
- 0392US5364906ALow viscosity polymer polyols with improved dispersion stabilityARCO CHEM TECH·Filed 1993·Granted Nov 15, 1994·65 cites·15 claims
- 0492US4463107APolymer/polyol compositions having improved combustion resistanceUNION CARBIDE CORP·Filed 1982·Granted Jul 31, 1984·62 cites·25 claims
- 0589US4883825AProcess for the manufacture of low density, flexible polyurethane foamsUNION CARBIDE CHEM PLASTIC·Filed 1987·Granted Nov 28, 1989·44 cites·14 claims
- 0689US4226756AMixtures of extenders and polyols or polymer/polyols useful in polyurethane productionUNION CARBIDE CORP·Filed 1978·Granted Oct 7, 1980·44 cites·2 claims
- 0788US4652589APolymer/polyols having improved combustion resistance and intrinsic viscosity, methods of making same and polyurethanes prepared therefromUNION CARBIDE CORP·Filed 1985·Granted Mar 24, 1987·56 cites·88 claims
- 0884US5668191AOne-shot cold molded flexible polyurethane foam from low primary hydroxyl polyols and process for the preparation thereofARCO CHEM TECH·Filed 1995·Granted Sep 16, 1997·42 cites·20 claims
- 0982US5395860AFlexible polyurethane foams using chlorinated alkanesARCO CHEM TECH·Filed 1993·Granted Mar 7, 1995·42 cites·32 claims
- 1080US5496894ALow viscosity polymer polyols with improved dispersion stabilityARCO CHEM TECH·Filed 1994·Granted Mar 5, 1996·28 cites·20 claims
- 1172US5549841AProcess for manufacturing foam with improved wet set propertiesARCO CHEM TECH·Filed 1995·Granted Aug 27, 1996·23 cites·10 claims
- 1272US4000218AProcess for preparing particulate polyurethane polymers and the polymers derived therefromUNION CARBIDE CORP·Filed 1975·Granted Dec 28, 1976·24 cites·18 claims
- 1371US6127443AEnergy management polyurethane rigid foams with high recoveryBAYER ANTWERP N V·Filed 1998·Granted Oct 3, 2000·23 cites·16 claims
- 1471US5084486AReactive feed stream to replace inert blowing agent feed stream in a polyurethane foam processUNION CARBIDE CHEM PLASTIC·Filed 1990·Granted Jan 28, 1992·21 cites·33 claims
- 1571US4312973APolyurethane elastomers prepared from polyol or polymer/polyol-chain extender mixturesUNION CARBIDE CORP·Filed 1980·Granted Jan 26, 1982·20 cites·7 claims
- 1667US4283500APolymer/polyisocyanatesUNION CARBIDE CORP·Filed 1980·Granted Aug 11, 1981·20 cites·47 claims
- 1758US5718856AProcess for manufacturing foam with improved wet set propertiesARCO CHEM TECH·Filed 1996·Granted Feb 17, 1998·13 cites·10 claims
- 1855US4797501ASilicone-based stabilizers useful in the preparation of improved polyurethane foamsUNION CARBIDE CORP·Filed 1987·Granted Jan 10, 1989·14 cites·9 claims
- 1951US4119584APhenolic foam modified with phosphorus-containing isocyanate-terminated prepolymersUNION CARBIDE CORP·Filed 1977·Granted Oct 10, 1978·8 cites·14 claims
- 2045US4814359AProcess for producing flexible polyurethane foam using hexahydro-S-triazine catalystsUNION CARBIDE CORP·Filed 1987·Granted Mar 21, 1989·6 cites·10 claims
- 2133US4902723AProcess for producing flexible polyurethane foam using hexahydro-s-triazine catalystsUNION CARBIDE CHEM PLASTIC·Filed 1988·Granted Feb 20, 1990·2 cites·3 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →