Variable ratio drive system
CA 2410315 A1 · Owner: Allard, John · Inventors: Allard, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A variable ratio drive system including at least one variable diameter sprocket (22,24) is described herein. The variable diameter sprocket includes a support (36) and at least three radially movable sprocket portions (50a-50e) mounted to the support. A diameter changing mechanism is provided to selectively move the sprocket portions.
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 May 29, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 29, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 29, 2023.
- 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.