Granted Patent
Utility
US 4,156,573 · App. 05/661,589
Typewriter ribbon cartridge
Inventors:
Carl P. Anderson, Thomas E. Hanson
Patented Case
View Patent ↗
Granted: May 29, 1979
Filed: Feb 26, 1976
Inventors
Carl P. Anderson
Thomas E. Hanson
Assignee (at issue)
SCM Consultants, Inc.
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.