Granted Patent
Utility
US 5,973,146 · App. 08/128,332
Process for the preparation of aminated diketobis (aryl or heteroaryl)pyrrolopyrroles and the use thereof as photoconductive substances
Inventors:
Alain C. Rochat, Olof Wallquist, Abul Iqbal, Jin Mizuguchi
Patented Case
View Patent ↗
Granted: Oct 26, 1999
Filed: Sep 29, 1993
Inventors
Alain C. Rochat
Olof Wallquist
Abul Iqbal
Jin Mizuguchi
Assignee (at issue)
Ciba Specialty Chemicals 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.