Granted Patent
Utility
US 4,521,749 · App. 06/420,572
Simultaneous amplitude and angle modulation using detection of complex zeroes
Inventor:
Gordon B. Lockhart
Patented Case
View Patent ↗
Granted: Jun 4, 1985
Filed: Sep 20, 1982
Inventor
Gordon B. Lockhart
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT 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.