Granted Patent
Utility
US 4,273,997 · App. 06/063,422
Automatic passbook reader/writer apparatus
Inventors:
Donald L. Bumgardner, James N. Schreiber
Patented Case
View Patent ↗
Granted: Jun 16, 1981
Filed: Aug 3, 1979
Inventors
Donald L. Bumgardner
James N. Schreiber
Assignee (at issue)
Burroughs, 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.