Granted Patent
Utility
US 4,515,451 · App. 06/498,619
Indexing microfilm
Inventors:
Harold H. Benham, Jr., Thomas R. Wells
Patented Case
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Granted: May 7, 1985
Filed: May 27, 1983
Inventors
Harold H. Benham, Jr.
Thomas R. Wells
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.