Granted Patent
Utility
US 4,364,875 · App. 06/281,123
Process for the preparation of certain diphenyl ethers
Inventors:
Richard Sehring, Wolfgang Buck
Patented Case
View Patent ↗
Granted: Dec 21, 1982
Filed: Jul 7, 1981
Inventors
Richard Sehring
Wolfgang Buck
Assignee (at issue)
Celamerck GmbH & Co. KG
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.