Granted Patent
Utility
US 4,959,530 · App. 07/320,236
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Inventor:
David F. O'Connor
Patented Case
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Granted: Sep 25, 1990
Filed: Mar 7, 1989
Inventor
David F. O'Connor
Assignee (at issue)
Checkrobot, 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.