Granted Patent
Utility
US 4,655,099 · App. 06/705,748
Noiseless stepper motor
Inventor:
Charles Hansen
Patented Case
View Patent ↗
Granted: Apr 7, 1987
Filed: Feb 26, 1985
Inventor
Charles Hansen
Assignee (at issue)
TRI-TECH 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.