Granted Patent
Utility
US 4,414,397 · App. 06/337,564
Production of alkenyl substituted aliphatic dicarboxylic anhydrides
Inventor:
Justin C. Powell
Patented Case
View Patent ↗
Granted: Nov 8, 1983
Filed: Jan 7, 1982
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.