Granted Patent
Utility
US 4,598,393 · App. 06/597,485
Three-beam optical servo tracking system with two-track parallel readout
Inventors:
Gerald A. Pierce, James L. Buxton, Norman A. Peppers, Warren J. Vinzant
Patented Case
View Patent ↗
Granted: Jul 1, 1986
Filed: Apr 6, 1984
Inventors
Gerald A. Pierce
James L. Buxton
Norman A. Peppers
Warren J. Vinzant
Assignee (at issue)
Drexler Technology 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.