Granted Patent
Utility
US 4,903,420 · App. 07/260,080
Mining tooth point
Inventors:
John S. Kreitzberg, Herbert E. Jones, Terry L. Briscoe
Patented Case
View Patent ↗
Granted: Feb 27, 1990
Filed: Oct 20, 1988
Inventors
John S. Kreitzberg
Herbert E. Jones
Terry L. Briscoe
Assignee (at issue)
ESCO GROUP LLC
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.