Granted Patent
Utility
US 4,255,351 · App. 06/017,872
Sulfonic acid esters of 2,2,2-trichloroethylhydroxycyclobutanones
Inventors:
Pierre Martin, Hans Greuter, Daniel Bellus
Patented Case
View Patent ↗
Granted: Mar 10, 1981
Filed: Mar 5, 1979
Inventors
Pierre Martin
Hans Greuter
Daniel Bellus
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.