Granted Patent
Utility
US 4,930,621 · App. 07/245,117
Attachments for power turns
Inventors:
Robert D. Brown, Russell J. Hogsett, Richard A. Compton, Thomas W. Swisher
Patented Case
View Patent ↗
Granted: Jun 5, 1990
Filed: Sep 16, 1988
Inventors
Robert D. Brown
Russell J. Hogsett
Richard A. Compton
Thomas W. Swisher
Assignee (at issue)
Portec, 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.