Granted Patent
Utility
US 5,547,925 · App. 08/200,677
Low toxicity terpene drilling fluid and drilling fluid additive
Inventor:
William M. Duncan, Jr.
Patented Case
View Patent ↗
Granted: Aug 20, 1996
Filed: Feb 23, 1994
Inventor
William M. Duncan, Jr.
Assignee (at issue)
Integrity Industries, 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.