Granted Patent
Utility
US 4,239,107 · App. 06/008,461
Cartridge assembly apparatus for typewriters
Inventors:
Richard G. Boyatt, Jr., Donald J. Steger
Patented Case
View Patent ↗
Granted: Dec 16, 1980
Filed: Feb 1, 1979
Inventors
Richard G. Boyatt, Jr.
Donald J. Steger
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.