Granted Patent
Utility
US 4,335,631 · App. 06/173,202
Method for making a shear blade
Inventors:
Leon A. Wirt, Arthur A. Webb
Patented Case
View Patent ↗
Granted: Jun 22, 1982
Filed: Feb 13, 1980
Inventors
Leon A. Wirt
Arthur A. Webb
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.