Granted Patent
Utility
US 4,533,803 · App. 06/542,865
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Inventors:
Wilbert E. Beller, George D. Georgacakis, George Obermann
Patented Case
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Granted: Aug 6, 1985
Filed: Oct 17, 1983
Inventors
Wilbert E. Beller
George D. Georgacakis
George Obermann
Assignee (at issue)
The Singer Company Limited
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.