Granted Patent
Utility
US 4,372,889 · App. 06/267,963
Preparation of carboxylic acids
Inventor:
Nabil Rizkalla
Patented Case
View Patent ↗
Granted: Feb 8, 1983
Filed: May 28, 1981
Inventor
Nabil Rizkalla
Assignee (at issue)
The Halcon SD Group, 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.