Granted Patent
Utility
US 4,244,321 · App. 05/877,772
Electrographic development electrode
Inventor:
John D. Plumadore
Patented Case
View Patent ↗
Granted: Jan 13, 1981
Filed: Feb 14, 1978
Inventor
John D. Plumadore
Assignee (at issue)
James River Graphics Limited
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.