Granted Patent
Utility
US 5,362,713 · App. 07/860,291
Drilling mud compositions
Inventors:
John A. Westland, Glenn S. Penny, Deborah A. Lenk
Patented Case
View Patent ↗
Granted: Nov 8, 1994
Filed: Mar 26, 1992
Inventors
John A. Westland
Glenn S. Penny
Deborah A. Lenk
Assignee (at issue)
Weyerhaeuser NR 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.