Granted Patent
Utility
US 4,281,293 · App. 06/051,297
Planar QPSK demodulator
Inventors:
William H. Childs, Christoph E. Mahle
Patented Case
View Patent ↗
Granted: Jul 28, 1981
Filed: Jun 22, 1979
Inventors
William H. Childs
Christoph E. Mahle
Assignee (at issue)
Communications Satellite 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.