IP Library Granted Patent US 4,361,521
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.

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Quick Facts
Patent No.
US 4,361,521
App. No.
06/228,656
Filed
1981-01-26
Granted
1982-11-30
Kind
A