Granted Patent
Utility
US 4,264,773 · App. 06/017,830
Preparation of 2-chloro-thioxanthone
Inventors:
Charles Pigerol, Michel Bouisset, Michel Chignac, Claude Grain
Patented Case
View Patent ↗
Granted: Apr 28, 1981
Filed: Mar 5, 1979
Inventors
Charles Pigerol
Michel Bouisset
Michel Chignac
Claude Grain
Assignee (at issue)
Labaz
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.