Granted Patent
Utility
US 4,664,087 · App. 06/756,546
Variable rate purge control for refueling vapor recovery system
Inventor:
Douglas R. Hamburg
Patented Case
View Patent ↗
Granted: May 12, 1987
Filed: Jul 19, 1985
Inventor
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.