Variable speed transmission system
CA 2037645 C · Owner: Liao, Peter B.S. · Inventors: Chien, Shi-Hai
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is an improved variable speed transmission system adapted for, in particular, an electrically powered vehicle. The system is operated by a common manual gear shift. The manual gear shift has a power source made up of a specially designed electric motor having a rotatable outer shell which is relatively moveable with respect to a core rotor so that the power from the rotatable outer shell and from the core rotor of the electric motor can be output respectively to front and a rear differential gear devices, and the vehicle can be powered to move via the differential gear devices. Respective transmission shafts between the electric motor and the front and rear differential gear …
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 6, 1991 and granted May 17, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 6, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 6, 2013.
- 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.