Granted Patent
Utility
US 4,268,693 · App. 05/960,697
3-Hydroxydiphenyl ethers
Inventors:
Rene Muntwyler, Kurt Burdeska
Patented Case
View Patent ↗
Granted: May 19, 1981
Filed: Nov 14, 1978
Inventors
Rene Muntwyler
Kurt Burdeska
Assignee (at issue)
Ciba-Geigy
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.