Granted Patent
Utility
US 4,297,513 · App. 06/153,985
Process for the preparation of benzophenone thioethers
Inventors:
Louis Felder, Rudolf Kirchmayr
Patented Case
View Patent ↗
Granted: Oct 27, 1981
Filed: May 28, 1980
Inventors
Louis Felder
Rudolf Kirchmayr
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.