Granted Patent
Utility
US 4,323,697 · App. 06/219,787
Process for preparing ethylidene diacetate
Inventor:
Nabil Rizkalla
Patented Case
View Patent ↗
Granted: Apr 6, 1982
Filed: Dec 24, 1980
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.