Power transmission
CA 2012134 C · Owner: General Motors Corporation · Inventors: Klemen, Donald
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure A power transmission has a planetary gear arrangement controlled by a plurality of selectively engageable clutches and brakes to provide forward and reverse speed ratios. A selectively operable input gear arrangement is utilized to establish a negative ratio of substantially 1:1 between the transmission input and the planetary gear arrangement. The selective use of the negative ratio input permits substantially equal forward and reverse drive ratios. The negative ratio input arrangement also permits extended coverage when employed with some of the other forward ratios established by the planetary gear arrangement.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed March 14, 1990 and granted July 5, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 14, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 14, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.