Granted Patent
Utility
US 4,448,394 · App. 06/432,052
High low safety apparatus for drilling rigs
Inventor:
Joseph L. LeMoine
Patented Case
View Patent ↗
Granted: May 15, 1984
Filed: Sep 30, 1982
Inventor
Joseph L. LeMoine
Assignee (at issue)
Koomey, 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.