Granted Patent
Utility
US 4,577,427 · App. 06/609,749
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Inventor:
John P. Browne
Patented Case
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Granted: Mar 25, 1986
Filed: May 14, 1984
Inventor
John P. Browne
Assignee (at issue)
NEI Canada 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.