Granted Patent
Utility
US 4,813,822 · App. 07/141,476
Power drill system with adjustable depth sensing means
Inventor:
Paul A. Biek
Patented Case
View Patent ↗
Granted: Mar 21, 1989
Filed: Jan 5, 1988
Inventor
Paul A. Biek
Assignee (at issue)
Dresser Industries, 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.