Granted Patent
Utility
US 5,900,839 · App. 08/927,887
Radio transmission apparatus comprising a retractable antenna and an antenna device for such apparatus
Inventor:
David Duperray
Patented Case
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Granted: May 4, 1999
Filed: Sep 11, 1997
Inventor
David Duperray
Assignee (at issue)
U.S. Philips 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.