Granted Patent
Utility
US 4,446,389 · App. 06/358,395
Quadrature tach decoder circuit
Inventors:
Marshall Williams, David O'Gwynn
Patented Case
View Patent ↗
Granted: May 1, 1984
Filed: Mar 15, 1982
Inventors
Marshall Williams
David O'Gwynn
Assignee (at issue)
Ampex 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.