Granted Patent
Utility
US 4,264,221 · App. 05/968,321
Print element cartridge
Inventors:
Adolph B. Habich, Ronald E. Hunt
Patented Case
View Patent ↗
Granted: Apr 28, 1981
Filed: Dec 11, 1978
Inventors
Adolph B. Habich
Ronald E. Hunt
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.