Granted Patent
Utility
US 4,896,562 · App. 07/173,195
Valve actuator differential worm planetary gear drive
Inventors:
Ivan E. Wilkinson, Charles L. Hylton, R. Gregory Pence
Patented Case
View Patent ↗
Granted: Jan 30, 1990
Filed: Mar 24, 1988
Inventors
Ivan E. Wilkinson
Charles L. Hylton
R. Gregory Pence
Assignee (at issue)
Limitorque 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.