Variable ratio drive system
CA 2230426 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 a variable diameter sprocket and a sprocket diameter changing mechanism is described herein. The variable diameter sprocket includes sprocket portions so mounted in radial channels of a circular support as to be radially movable therein. The sprocket portions include a pin that may be inserted in apertures of the channels. The diameter changing mechanism includes first and second angled abutting portions configured and sized to first move the sprocket portions laterally, then move them radially before allowing them to be reinserted in a new position to cause the diameter modification.
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 February 25, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 25, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 25, 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.