Granted Patent
Utility
US 4,533,133 · App. 06/425,220
Method and apparatus for preventing insertion errors
Inventor:
Kenneth A. Hams
Patented Case
View Patent ↗
Granted: Aug 6, 1985
Filed: Sep 28, 1982
Inventor
Kenneth A. Hams
Assignee (at issue)
Bell and Howell, LLC
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.