Granted Patent
Utility
US 4,375,049 · App. 06/190,157
Stepping motor drive circuit for bi-directional rotation
Inventor:
Paul Grand Chavin
Patented Case
View Patent ↗
Granted: Feb 22, 1983
Filed: Sep 24, 1980
Inventor
Paul Grand Chavin
Assignee (at issue)
Timex 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.