Granted Patent
Utility
US 5,306,342 · App. 08/040,232
Production of pigments
Inventor:
John A. Stirling
Patented Case
View Patent ↗
Granted: Apr 26, 1994
Filed: Mar 30, 1993
Inventor
John A. Stirling
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.