Heat exchanger duct
CA 2039495 A1 · Owner: Schmid, Klaus E. · Inventors: Schmid, Klaus E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
It is known that in heat cycle engines cranks are moved by pistons which are kept in motion by an expanding and contracting enclosed gas. This invention comprises an endless elongated duct which, with its advanced spiral shape, an enclosed expanding and contracting gas or fluid and two incorporated valves, rotates around a central hub axle without employing cranks or pistons.
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 28, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 28, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 28, 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.