Granted Patent
Utility
US 5,544,640 · App. 08/498,270
System and method for heating an oxygen sensor via multiple heating elements
Inventors:
Christopher P. Thomas, Timothy A. Coatesworth, Kenneth P. DeGroot, Jeffery C. Ehlers, Mark E. McMackin
Patented Case
View Patent ↗
Granted: Aug 13, 1996
Filed: Jul 3, 1995
Inventors
Christopher P. Thomas
Timothy A. Coatesworth
Kenneth P. DeGroot
Jeffery C. Ehlers
Mark E. McMackin
Assignee (at issue)
Chrysler Group LLC
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.