Granted Patent
Utility
US 4,361,521 · App. 06/228,656
Difluorophthaloyl fluoride
Inventor:
Michael J. Fifolt
Patented Case
View Patent ↗
Granted: Nov 30, 1982
Filed: Jan 26, 1981
Inventor
Michael J. Fifolt
Assignee (at issue)
Occidental Chemical Corporation
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.