Granted Patent
Utility
US 6,371,702 · App. 09/376,893
Spade blade drill and method of making
Inventors:
A. Bruce DeWald, Jr., Fred T. Shallenberger
Patented Case
View Patent ↗
Granted: Apr 16, 2002
Filed: Aug 18, 1999
Inventors
A. Bruce DeWald, Jr.
Fred T. Shallenberger
Assignee (at issue)
Kennametal PC Inc.
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.