Granted Patent
Utility
US 5,863,999 · App. 08/062,806
Viscosity index improving additives for phosphate ester-containing hydraulic fluids
Inventors:
Bernard Kinker, Robert Howard Gore, Charles W. Hyndman, Bridget Marie Stevens
Patented Case
View Patent ↗
Granted: Jan 26, 1999
Filed: Apr 20, 1998
Inventors
Bernard Kinker
Robert Howard Gore
Charles W. Hyndman
Bridget Marie Stevens
Assignee (at issue)
Rohm and Haas 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.