Motor
CA 2087294 A1 · Owner: Dupont, Devin · Inventors: Dupont, Devin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A motor having a liquid filled housing with a hollow cylindrical body emersed in the liquid filled housing and mounted for rotation about a transverse axis. The hollow cylindrical body has a first end, a second end an exterior, surface and interior walls which extend between the first end and the second end. Hollow gas receptacles are appended to and sealing engage both the first end and the second end of the hollow cylindrical body whereby a buoyant gas is trapped within the hollow cylindrical body. A weighted piston is disposed within the hollow cylindrical body. The weighted piston has peripheral seals which form an air tight seal with the interior walls. The weighted piston falls by …
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 14, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 14, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 14, 2015.
- 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.