Granted Patent
Utility
US 4,348,530 · App. 06/228,533
Thioxanthonecarboxylic acids, esters, thioesters and amides with reactive functional groups
Inventors:
Vratislav Kvita, Hans Zweifel, Martin Roth, Louis Felder
Patented Case
View Patent ↗
Granted: Sep 7, 1982
Filed: Jan 26, 1981
Inventors
Vratislav Kvita
Hans Zweifel
Martin Roth
Louis Felder
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.