Granted Patent
Utility
US 4,172,486 · App. 05/887,147
Apparatus for cleaning a track assembly
Inventors:
Robert N. Stedman, Robert T. McNeely
Patented Case
View Patent ↗
Granted: Oct 30, 1979
Filed: Mar 16, 1978
Inventors
Robert N. Stedman
Robert T. McNeely
Assignee (at issue)
Caterpillar Tractor Co.
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.