Granted Patent
Utility
US 4,388,572 · App. 06/150,051
Constant speed regulator for DC motors
Inventor:
Wolfgang Rosenfeldt
Patented Case
View Patent ↗
Granted: Jun 14, 1983
Filed: May 15, 1980
Inventor
Wolfgang Rosenfeldt
Assignee (at issue)
Sybron 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.