Granted Patent
Utility
US 4,772,743 · App. 07/118,768
Bifunctional emulsifiers based on perhydrobisphenols and carboxylic acid anhydrides
Inventors:
Adolf Schmidt, Herbert Eichenauer, Alfred Pischtschan
Patented Case
View Patent ↗
Granted: Sep 20, 1988
Filed: Nov 9, 1987
Inventors
Adolf Schmidt
Herbert Eichenauer
Alfred Pischtschan
Assignee (at issue)
Bayer Aktiengesellschaft
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.