Granted Patent
Utility
US 4,860,493 · App. 07/269,492
Non-backdriving actuator for opening and closing a window sash
Inventor:
Robert F. Lense
Patented Case
View Patent ↗
Granted: Aug 29, 1989
Filed: Nov 10, 1988
Inventor
Robert F. Lense
Assignee (at issue)
ARTERICA INC.
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.