Granted Patent
Utility
US 4,305,690 · App. 06/064,970
Delivery tray return mechanism for a bale wagon
Inventors:
L. Dennis Butler, Donald M. Grey, H. Berton Stringfellow, Randall E. Zipser
Patented Case
View Patent ↗
Granted: Dec 15, 1981
Filed: Aug 8, 1979
Inventors
L. Dennis Butler
Donald M. Grey
H. Berton Stringfellow
Randall E. Zipser
Assignee (at issue)
Sperry Corp.
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.