Granted Patent
Utility
US 4,787,464 · App. 07/120,294
Variable rake mine tool insert and method of use
Inventor:
Randall W. Ojanen
Patented Case
View Patent ↗
Granted: Nov 29, 1988
Filed: Nov 13, 1987
Inventor
Randall W. Ojanen
Assignee (at issue)
GTE Products Corporation
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.