Inventor · disambiguated record
Robert S. Irwin
Also filed as: IRWIN ROBERT S · IRWIN ROBERT SAMUEL
40 granted patents·519 citations·filing 1978–1995
98Inventor score
Top patents by PatentIndex Score
40 records- 0191US4269965AAromatic polyester which forms optically anisotropic melts and filaments thereofDU PONT·Filed 1979·Granted May 26, 1981·45 cites·16 claims
- 0291US4176223APolyimide-esters and filaments prepared from 4-(4'-carboxyphthalimido)benzoic acid or 4-(4'-hydroxyphthalimido)phenolDU PONT·Filed 1978·Granted Nov 27, 1979·46 cites·5 claims
- 0390US4383105APolyimide-esters and filamentsDU PONT·Filed 1981·Granted May 10, 1983·46 cites·8 claims
- 0488US5039785APreparation of aromatic polyamide having pendant carboxyl groupsDU PONT·Filed 1989·Granted Aug 13, 1991·37 cites·6 claims
- 0586US4245082APolyesters derived from 3,4'-dihydroxy-benzophenones or 3-hydroxy-4'-(4-hydroxyphenyl-)benzophenone and certain aromatic dicarboxylic acids and filaments thereofDU PONT·Filed 1979·Granted Jan 13, 1981·33 cites·15 claims
- 0686US4232143APolyester which exhibits anisotropy in the melt containing p-oxybenzoyl units and 4,4'-dioxybenzophenone units or methyl and chloro derivatives thereofDU PONT·Filed 1979·Granted Nov 4, 1980·33 cites·15 claims
- 0784US4232144APolyester which exhibits anisotropy in the melt containing p-oxybenzoyl units and 4-oxy-3'-carbonylbenzophenone units or methyl and chloro derivatives of said unitsDU PONT·Filed 1979·Granted Nov 4, 1980·28 cites·16 claims
- 0880US4640972AFilament of polyimide from pyromellitic acid dianhydride and 3,4'-oxydianilineDU PONT·Filed 1985·Granted Feb 3, 1987·24 cites·5 claims
- 0980US4335232AOptically anisotropic melt forming polyestersDU PONT·Filed 1981·Granted Jun 15, 1982·27 cites·9 claims
- 1077US5026819AHigh strength fiber or film of aromatic copolyamide with pendant carboxyl groupsDU PONT·Filed 1989·Granted Jun 25, 1991·20 cites·3 claims
- 1173US5212258AAramid block copolymersDU PONT·Filed 1991·Granted May 18, 1993·19 cites·31 claims
- 1273US4188476AAromatic polyester consisting essentially of p-oxybenzoyl units, terephthaloyl units, 2,6-dioxynaphthalene or 2,6-dioxyanthraquinone units and m-oxybenzoyl or 1,3-dioxyphenylene unitsDU PONT·Filed 1979·Granted Feb 12, 1980·17 cites·8 claims
- 1366US4499259AOptically anisotropic melt forming copolyestersDU PONT·Filed 1983·Granted Feb 12, 1985·15 cites·5 claims
- 1464US4439596AChlorination of hydroquinoneDU PONT·Filed 1983·Granted Mar 27, 1984·6 cites·3 claims
- 1559US5292856AAromatic condensation polyamides with pendant ester and amide groupsDU PONT·Filed 1993·Granted Mar 8, 1994·10 cites·6 claims
- 1659US5189141APolyaramide with pendant carboxyl groupsDU PONT·Filed 1991·Granted Feb 23, 1993·10 cites·6 claims
- 1758US5310861ADrawable high tensile strength aramidsDU PONT·Filed 1992·Granted May 10, 1994·11 cites·14 claims
- 1857US5202410APolyimides from substituted benzidineDU PONT·Filed 1991·Granted Apr 13, 1993·9 cites·7 claims
- 1955US4500699AOptically anisotropic melt forming copolyestersDU PONT·Filed 1984·Granted Feb 19, 1985·10 cites·8 claims
- 2051US4487916AMelt-spinnable copolyestersDU PONT·Filed 1983·Granted Dec 11, 1984·8 cites·6 claims
- 2146US5395917APolyimides from 4-(3-aminophenoxy)benzoic acidDU PONT·Filed 1993·Granted Mar 7, 1995·5 cites·18 claims
- 2246US5334693AAramid compositionDU PONT·Filed 1993·Granted Aug 2, 1994·5 cites·11 claims
- 2345US5212257AAramid block copolymersDU PONT·Filed 1991·Granted May 18, 1993·5 cites·26 claims
- 2445US4169876AProcess for spinning flame-resistant acrylonitrile polymer fibersDU PONT·Filed 1978·Granted Oct 2, 1979·4 cites·5 claims
- 2544US5691443ADrawable high tensile strength aramidsDU PONT·Filed 1995·Granted Nov 25, 1997·7 cites·36 claims
- 2644US5543492AHydrolysis-resistant aramidsDU PONT·Filed 1995·Granted Aug 6, 1996·7 cites·22 claims
- 2744US4381389AOptically anisotropic melt forming copolyestersDU PONT·Filed 1982·Granted Apr 26, 1983·4 cites·9 claims
- 2842US4719280AAnisotropic melt polyesters with improved glass transition temperatureDU PONT·Filed 1986·Granted Jan 12, 1988·4 cites·9 claims
- 2942US4496712AOptically anisotropic melt forming copolyestersDU PONT·Filed 1983·Granted Jan 29, 1985·5 cites·9 claims
- 3041US5288835AMelt processable polyesters and poly(imide-esters)DU PONT·Filed 1993·Granted Feb 22, 1994·3 cites·17 claims
- 3140US5346985ADrawable high tensile strength aramidsDU PONT·Filed 1991·Granted Sep 13, 1994·3 cites·16 claims
- 3239US4398003AProcess for preparing thermoset polymer spheresDOW CHEMICAL CO·Filed 1981·Granted Aug 9, 1983·6 cites·12 claims
- 3334US5175236ATough, high strength fibers of copolyesters prepared from isophthalic acid; 4,4'-oxydibenzoic acid; and hydroquinone diacetateDU PONT·Filed 1991·Granted Dec 29, 1992·2 cites·1 claims
- 3433US5219898ASpin dopes from poly[2,2'-bis(trifluoromethyl)benzidine terephthalamide] and from poly[2,2'-bis(1,1,2,2-tetrafluoroethoxy benzidine terephthalamide]DU PONT·Filed 1992·Granted Jun 15, 1993·2 cites·3 claims
- 3533US5006630ASoluble amorphous para-oriented aromatic polyamide from 2,2'-dibromo-5,5'-dimethoxy-[1,1'-biphenyl]-4,4'-diamineDU PONT·Filed 1989·Granted Apr 9, 1991·1 cites·5 claims
- 3631US5459231ADrawable high tensile strength aramidsDU PONT·Filed 1991·Granted Oct 17, 1995·1 cites·28 claims
- 3731US5173240ATension-free heat-treatment of aramid fiber and fibridsDU PONT·Filed 1991·Granted Dec 22, 1992·1 cites·8 claims
- 3831US5004834APreparation of polyamides from unstable diaminesDU PONT·Filed 1990·Granted Apr 2, 1991·0 cites·4 claims
- 3931US4766256AAnisotropic melt polyesters with improved glass transition temperatureDU PONT·Filed 1987·Granted Aug 23, 1988·0 cites·5 claims
- 4030US5122416APoly[2,2'-bis(trifluoromethyl)benzidine terephthalamide] spin dopes and fibers therefromDU PONT·Filed 1990·Granted Jun 16, 1992·0 cites·1 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →