Granted Patent
Utility
US 4,782,811 · App. 07/032,509
Exhaust gas recirculation valve construction and method of making the same
Inventors:
Chip Hewette, Jay L. Lewis
Patented Case
View Patent ↗
Granted: Nov 8, 1988
Filed: Mar 30, 1987
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.