Granted Patent
Utility
US 4,557,646 · App. 06/533,719
Dwell and depth attachment
Inventor:
Paul A. Biek
Patented Case
View Patent ↗
Granted: Dec 10, 1985
Filed: Sep 19, 1983
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.