Inventor
SCHWARTZ WILLIS T
US19 patents
Patents
19 patentsUS5171828ADec 15, 1992
Copolyimide ODPA/BPDA/4,4'-ODA or P-PDA
OCCIDENTAL CHEM CO61 citations92
US5021168AJun 4, 1991
Process for the preparation and recovery of oxydiphthalic anhydrides
OCCIDENTAL CHEM CO31 citations90
US4870194ASep 26, 1989
Process for the preparation and recovery of oxdiphthalic anhydrides
OCCIDENTAL CHEM CO37 citations90
US5077382ADec 31, 1991
Copolyimide odpa/bpda/4,4'-oda or p-pda
OCCIDENTAL CHEM CO25 citations89
US4697023ASep 29, 1987
Process for the preparation of oxy-diphthalic anhydrides
OCCIDENTAL CHEM CO18 citations81
US5101006AMar 31, 1992
Polyimides and copolyimides based on halo-oxydiphthalic anhydrides
OCCIDENTAL CHEM CO6 citations73
US5003086AMar 26, 1991
Process of preparing dioxydiphthalic anhydride
OCCIDENTAL CHEM CO7 citations73
US5003031AMar 26, 1991
Polyimides and co-polyimides based on dioxydiphthalic anhydride
OCCIDENTAL CHEM CO9 citations73
US4837404AJun 6, 1989
Process for the preparation of oxy-diphthalic anhydrides
OCCIDENTAL CHEM CO13 citations73
US4827000AMay 2, 1989
Process for the preparation of phenoxy phthalic anhydrides
OCCIDENTAL CHEM CO15 citations73
US5185451AFeb 9, 1993
Bis-imides of dioxydiphthalic acid
OCCIDENTAL CHEM CO12 citations72
US4962206AOct 9, 1990
Process for the preparation of 4-bromophthalic anhydride
OCCIDENTAL CHEM CO10 citations72
US4447572AMay 8, 1984
Fire retardant polyamide
OCCIDENTAL CHEM CO14 citations72
US5233049AAug 3, 1993
Highly fluorinated bis-imides
OCCIDENTAL CHEM CO16 citations67
US5089631AFeb 18, 1992
Dioxydiphthalic anhydride
OCCIDENTAL CHEM CO2 citations62
US4960905AOct 2, 1990
Phenoxy phthalic anhydrides
OCCIDENTAL CHEM CO2 citations62
US4943642AJul 24, 1990
Halo-oxydiphthalic anhydrides
OCCIDENTAL CHEM CO5 citations62
US5166404ANov 24, 1992
Dioxydiphthalic acid esters
OCCIDENTAL CHEM CO4 citations61
US5512686AApr 30, 1996
Method for the purification of dioxydiphthalic anhydride and ester intermediate made therein
OCCIDENTAL CHEM CO0 citations50