Granted Patent
Utility
US 4,187,329 · App. 05/112,393
Electrophotographic developing process and compositions for use therein
Inventor:
Walter Crooks
Patented Case
View Patent ↗
Granted: Feb 5, 1980
Filed: Feb 3, 1971
Inventor
Walter Crooks
Assignee (at issue)
International Business Machines Corporation
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.