Granted Patent
Utility
US 4,533,499 · App. 06/597,213
Process for the production of triaryl methane compounds
Inventors:
Malcolm C. Clark, John Barry Henshall, Derrick A. Hart
Patented Case
View Patent ↗
Granted: Aug 6, 1985
Filed: Apr 6, 1984
Inventors
Malcolm C. Clark
John Barry Henshall
Derrick A. Hart
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.