Granted Patent
Utility
US 4,586,803 · App. 06/673,275
Developing drum
Inventors:
Brian F. Moss, Ian B. Pilkington, Richard J. Brent
Patented Case
View Patent ↗
Granted: May 6, 1986
Filed: Nov 20, 1984
Inventors
Brian F. Moss
Ian B. Pilkington
Richard J. Brent
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.