Granted Patent
Utility
US 4,520,878 · App. 06/507,279
Spring cushion chisel plow shank assembly
Inventors:
David R. Smith, Maynard M. Herron
Patented Case
View Patent ↗
Granted: Jun 4, 1985
Filed: Jun 23, 1983
Inventors
David R. Smith
Maynard M. Herron
Assignee (at issue)
Hesston 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.