Granted Patent
Utility
US 4,677,045 · App. 06/859,669
Squarylium charge generating dye and electrophotographic photoconductor
Inventors:
Robert B. Champ, Robert L. Vollmer
Patented Case
View Patent ↗
Granted: Jun 30, 1987
Filed: May 5, 1986
Inventors
Robert B. Champ
Robert L. Vollmer
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.