Granted Patent
Utility
US 4,255,340 · App. 06/070,187
Method for preparing an alkenyl-substituted dicarboxylic acid anhydride
Inventor:
Justin C. Powell
Patented Case
View Patent ↗
Granted: Mar 10, 1981
Filed: Aug 27, 1979
Inventor
Justin C. Powell
Assignee (at issue)
Texaco Inc.
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.