Granted Patent
Utility
US 4,579,370 · App. 06/626,603
Multi-tone cancellation phrase and background
Inventors:
Thomas R. Corwin, William H. Mowry, Jr.
Patented Case
View Patent ↗
Granted: Apr 1, 1986
Filed: Jul 6, 1984
Inventors
Thomas R. Corwin
William H. Mowry, Jr.
Assignee (at issue)
Burroughs, Inc.
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.