Granted Patent
Utility
US 4,663,030 · App. 06/853,376
Disk rotor for selectifier screen
Inventors:
David E. Chupka, Mark W. Gilkey, Jimmy L. Winkler, Larry D. Markham
Patented Case
View Patent ↗
Granted: May 5, 1987
Filed: Apr 15, 1986
Inventors
David E. Chupka
Mark W. Gilkey
Jimmy L. Winkler
Larry D. Markham
Assignee (at issue)
Black Clawson Company, 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.