Granted Patent
Utility
US 4,297,041 · App. 06/025,824
Variable cam profile selection system for single element typewriter
Inventor:
John O. Schaefer
Patented Case
View Patent ↗
Granted: Oct 27, 1981
Filed: Apr 2, 1979
Inventor
John O. Schaefer
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.