Granted Patent
Utility
US 4,400,530 · App. 06/243,002
Process for preparing substituted diphenyl ethers
Inventor:
William S. Grove
Patented Case
View Patent ↗
Granted: Aug 23, 1983
Filed: Mar 12, 1981
Inventor
William S. Grove
Assignee (at issue)
PPG Industries, 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.