Granted Patent
Utility
US 5,842,517 · App. 08/850,528
Anti-rotational cementing apparatus
Inventor:
Malcolm G. Coone
Patented Case
View Patent ↗
Granted: Dec 1, 1998
Filed: May 5, 1997
Inventor
Malcolm G. Coone
Assignee (at issue)
Davis-Lynch, 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.