Granted Patent
Utility
US 6,203,719 · App. 08/781,848
Extended engine coolant lifetime through polymeric polycarboxylate secondary silicate stabilization
Inventors:
David E. Turcotte, Frances E. Lockwood
Patented Case
View Patent ↗
Granted: Mar 20, 2001
Filed: Jan 10, 1997
Inventors
David E. Turcotte
Frances E. Lockwood
Assignee (at issue)
Ashland, 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.