Granted Patent
Utility
US 4,559,622 · App. 06/416,416
Optical memory system providing improved focus detection and control by detecting reflected beam diameter variations at spaced predetermined locations in the system
Inventors:
Robert L. Hazel, Gilbert Y. Chan
Patented Case
View Patent ↗
Granted: Dec 17, 1985
Filed: Sep 9, 1982
Inventors
Robert L. Hazel
Gilbert Y. Chan
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.