Granted Patent
Utility
US 6,010,639 · App. 08/974,360
Controlled release supplemental coolant additive
Inventors:
Wayne A. Mitchell, Kurt D. Heinz, Clifford Alvin Ferrin, Jr., Narender P. Luthra
Patented Case
View Patent ↗
Granted: Jan 4, 2000
Filed: Nov 19, 1997
Inventors
Wayne A. Mitchell
Kurt D. Heinz
Clifford Alvin Ferrin, Jr.
Narender P. Luthra
Assignee (at issue)
Betzdearborn, 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.