Granted Patent
Utility
US 5,989,336 · App. 08/889,678
Cement composition
Inventors:
Robert B. Carpenter, J. Benjamin Bloys, David L. Johnson
Patented Case
View Patent ↗
Granted: Nov 23, 1999
Filed: Jul 8, 1997
Inventors
Robert B. Carpenter
J. Benjamin Bloys
David L. Johnson
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.