Granted Patent
Utility
US 4,338,890 · App. 06/220,711
Hood, muffler and air cleaner module for an internal combustion engine
Inventors:
Robert L. Shelby, Douglas A. Wilkins
Patented Case
View Patent ↗
Granted: Jul 13, 1982
Filed: Dec 29, 1980
Inventors
Robert L. Shelby
Douglas A. Wilkins
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.