Granted Patent
Utility
US 5,138,154 · App. 07/504,348
Shaft angle encoder with rotating off-axis interference pattern
Inventor:
Steven P. Hotelling
Patented Case
View Patent ↗
Granted: Aug 11, 1992
Filed: Apr 4, 1990
Inventor
Steven P. Hotelling
Assignee (at issue)
Gyration, 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.