Granted Patent
Utility
US 6,024,422 · App. 08/857,957
Large displacement variable pitch screw-driven system
Inventors:
David Drennen, Gustavus P. Bock, Ryan Lovell Wright
Patented Case
View Patent ↗
Granted: Feb 15, 2000
Filed: May 16, 1997
Inventors
David Drennen
Gustavus P. Bock
Ryan Lovell Wright
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.