Granted Patent
Utility
US 4,670,514 · App. 06/820,337
Production of hydrolyzed polymaleic anhydride
Inventor:
Peter Burke
Patented Case
View Patent ↗
Granted: Jun 2, 1987
Filed: Jan 21, 1986
Inventor
Peter Burke
Assignee (at issue)
Ciba-Geigy
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.