Granted Patent
Utility
US 4,659,750 · App. 06/741,079
Fluid loss control in oil field cements
Inventors:
Lawrence P. Sedillo, John C. Newlove, Robert C. Portnoy
Patented Case
View Patent ↗
Granted: Apr 21, 1987
Filed: Jun 4, 1985
Inventors
Lawrence P. Sedillo
John C. Newlove
Robert C. Portnoy
Assignee (at issue)
Exxon Chemical Patents, 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.