Granted Patent
Utility
US 5,060,621 · App. 07/399,192
Vapor purge control system
Inventors:
Jeffrey A. Cook, Douglas R. Hamburg
Patented Case
View Patent ↗
Granted: Oct 29, 1991
Filed: Aug 28, 1989
Inventors
Jeffrey A. Cook
Douglas R. Hamburg
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.