Granted Patent
Utility
US 4,825,840 · App. 07/215,244
Exhaust gas recirculation valve construction and method of making the same
Inventors:
Chip Hewette, Jay L. Lewis
Patented Case
View Patent ↗
Granted: May 2, 1989
Filed: Jul 5, 1988
Inventors
Chip Hewette
Jay L. Lewis
Assignee (at issue)
ROBERTSHAW CONTROLS PRIVATE LIMITED
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.