Granted Patent
Utility
US 6,530,858 · App. 09/956,518
Family of multi-speed planetary power transmission mechanisms having three planetary gearsets
Inventors:
Patrick B. Usoro, Chi-Kuan Kao, Madhusudan Raghavan
Patented Case
View Patent ↗
Granted: Mar 11, 2003
Filed: Sep 19, 2001
Inventors
Patrick B. Usoro
Chi-Kuan Kao
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.