Granted Patent
Utility
US 6,652,409 · App. 10/080,989
Family of multi-speed planetary transmission mechanisms having four clutches and two brakes
Inventors:
Chi-Kuan Kao, Patrick B. Usoro, Madhusudan Raghavan
Patented Case
View Patent ↗
Granted: Nov 25, 2003
Filed: Feb 22, 2002
Inventors
Chi-Kuan Kao
Patrick B. Usoro
Madhusudan Raghavan
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.