Granted Patent
Utility
US 4,592,681 · App. 06/547,702
Retraction apparatus for automatic feed drills or the like
Inventors:
Robert A. Pennison, Richard E. Eckman
Patented Case
View Patent ↗
Granted: Jun 3, 1986
Filed: Oct 31, 1983
Inventors
Robert A. Pennison
Richard E. Eckman
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.