Granted Patent
Utility
US 5,076,852 · App. 07/692,909
Cementing oil and gas wells
Inventors:
James B. Bloys, William N. Wilson, Roger D. Bradshaw
Patented Case
View Patent ↗
Granted: Dec 31, 1991
Filed: Apr 29, 1991
Inventors
James B. Bloys
William N. Wilson
Roger D. Bradshaw
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.