Granted Patent
Utility
US 3,934,393 · App. 05/507,822
Breakaway mechanism for an improved crop material roll forming machine
Inventors:
Willis R. Campbell, William F. Ostergren
Patented Case
View Patent ↗
Granted: Jan 27, 1976
Filed: Sep 20, 1974
Inventors
Willis R. Campbell
William F. Ostergren
Assignee (at issue)
Sperry Rand Corporation
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.