Granted Patent
Utility
US 5,387,346 · App. 08/094,482
Automatic transmission fluids and additives therefor
Inventors:
Rolfe J. Hartley, Douglas R. Chrisope
Patented Case
View Patent ↗
Granted: Feb 7, 1995
Filed: Jul 19, 1993
Inventors
Rolfe J. Hartley
Douglas R. Chrisope
Assignee (at issue)
Ethyl Petroleum Additives, 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.