Inventor
SCHMIDT JOHANNES E
9 patents
Patents
9 patentsUS5206433AApr 27, 1993
Preparation of formic acid
BASF AG26 citations92
US5225574AJul 6, 1993
Preparation of phthalic anhydride from o-xylene
BASF AG30 citations91
US4218568AAug 19, 1980
Preparation of formic acid
BASF AG27 citations81
US4217460AAug 12, 1980
Isolation of formic acid from its aqueous solutions
BASF AG22 citations81
US4568427AFeb 4, 1986
Continuous isolation of phthalic anhydride and maleic anhydride from reaction gases
BASF AG15 citations72
US4076594AFeb 28, 1978
Purification of formic acid by extractive distillation
BASF AG14 citations67
US4961827AOct 9, 1990
Obtaining very pure maleic anhydride from crude maleic anhydride
BASF AG6 citations59
US4369327AJan 18, 1983
Preparation of phthalic anhydride
BASF AG3 citations57
US4921977AMay 1, 1990
Obtaining maleic anhydride not prone to discolor
BASF AG4 citations55