Granted Patent
Utility
US 4,649,655 · App. 06/829,383
Drilling mud dehydration system
Inventor:
Eric B. Witten
Patented Case
View Patent ↗
Granted: Mar 17, 1987
Filed: Feb 13, 1986
Inventor
Eric B. Witten
Assignee (at issue)
Atlantic Richfield Company
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.