Granted Patent
Utility
US 4,675,760 · App. 06/838,741
Information signal recording and/or playback system and method using a prerecorded reference track
Inventors:
George A. Stadelmann, John P. Watney
Patented Case
View Patent ↗
Granted: Jun 23, 1987
Filed: Mar 11, 1986
Inventors
George A. Stadelmann
John P. Watney
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.