Granted Patent
Utility
US 4,476,349 · App. 06/363,469
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Inventors:
Jennie L. Cottrell, Deborah Hill
Patented Case
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Granted: Oct 9, 1984
Filed: Mar 30, 1982
Inventors
Jennie L. Cottrell
Deborah Hill
Assignee (at issue)
AT&T Bell Laboratories
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.