Granted Patent
Utility
US 4,477,382 · App. 06/451,826
Preparation of carboxylic acid anhydrides
Inventors:
Anil B. Goel, Harvey J. Richards
Patented Case
View Patent ↗
Granted: Oct 16, 1984
Filed: Dec 21, 1982
Inventors
Anil B. Goel
Harvey J. Richards
Assignee (at issue)
Ashland Oil, 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.