Granted Patent
Utility
US 4,212,420 · App. 06/049,755
Ribbon storage device
Inventor:
Edward F. Helinski
Patented Case
View Patent ↗
Granted: Jul 15, 1980
Filed: Jun 18, 1979
Inventor
Edward F. Helinski
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.