Granted Patent
Utility
US 4,494,375 · App. 06/463,688
Filtration system for diesel engine exhaust-I
Inventors:
Vemulapalli D. N. Rao, Wallace R. Wade
Patented Case
View Patent ↗
Granted: Jan 22, 1985
Filed: Feb 3, 1983
Inventors
Vemulapalli D. N. Rao
Wallace R. Wade
Assignee (at issue)
Ford Motor Company
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.