Four-wheel drive vehicle
CA 2226698 C · Owner: Kobayashi, Kazunori · Inventors: Kobayashi, Kazunori; Hamada, Tetsuro; Yakou, Takayuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A rear differential in a four-wheel drive vehicle includes a left and right clutches adapted to distribute a driving force transmitted from front wheels through a propeller shaft to left and right rear wheels. If the engagement of the left and right clutches is released only the front wheels are driven and in this manner the vehicle is brought into a front, wheel-drive state. If the left and right clutches are brought into their engaged states both, of the front wheels and the rear wheels are driven and in this manner the vehicle is brought, into a four-wheel drive state. By changing the engagement forces of the left and right clutches, different driving forces can be distributed to the …
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 January 13, 1998 and granted May 7, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 13, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 13, 2020.
- 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.