Granted Patent
Utility
US 4,933,609 · App. 07/211,523
Dynamic control system for braking DC motors
Inventor:
Harold V. Clark
Patented Case
View Patent ↗
Granted: Jun 12, 1990
Filed: Jun 23, 1988
Inventor
Harold V. Clark
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.