Granted Patent
Utility
US 4,499,550 · App. 06/430,390
Walsh function mixer and tone detector
Inventors:
John Michael Ray, Robert J. Martin
Patented Case
View Patent ↗
Granted: Feb 12, 1985
Filed: Sep 30, 1982
Inventors
John Michael Ray
Robert J. Martin
Assignee (at issue)
General Electric 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.