Granted Patent
Utility
US 4,989,221 · App. 07/431,712
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Inventors:
Shahid U. H. Qureshi, Fuyun Ling
Patented Case
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Granted: Jan 29, 1991
Filed: Nov 2, 1989
Inventors
Shahid U. H. Qureshi
Fuyun Ling
Assignee (at issue)
Codex 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.