Granted Patent
Utility
US 4,831,334 · App. 07/059,709
Envelope amplifier
Inventors:
Thomas Hudspeth, David S. Kaplan, Harold A. Rosen
Patented Case
View Patent ↗
Granted: May 16, 1989
Filed: Jun 8, 1987
Inventors
Thomas Hudspeth
David S. Kaplan
Harold A. Rosen
Assignee (at issue)
Hughes Aircraft Company
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.