Granted Patent
Utility
US 4,505,279 · App. 06/521,290
Staggered spiral rasp bar segments for axial flow combines
Inventors:
Steven J. Campbell, Keith A. Stickley, David R. Klingensmith
Patented Case
View Patent ↗
Granted: Mar 19, 1985
Filed: Aug 8, 1983
Inventors
Steven J. Campbell
Keith A. Stickley
David R. Klingensmith
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.