Granted Patent
Utility
US 4,828,327 · App. 07/161,506
Bit holder for miner
Inventor:
Edward Wechner
Patented Case
View Patent ↗
Granted: May 9, 1989
Filed: Feb 29, 1988
Inventor
Edward Wechner
Assignee (at issue)
Joy Technologies 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.