Granted Patent
Utility
US 6,550,459 · App. 09/766,963
Gaseous fuel system for bi-fuel engines
Inventor:
Richard Gibson
Patented Case
View Patent ↗
Granted: Apr 22, 2003
Filed: Jan 23, 2001
Inventor
Richard Gibson
Assignee (at issue)
General Motors 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.