Mass- and heat-exchange device
CA 2222084 A1 · Owner: Werlen, Etienne · Inventors: Lehman, Jean-Yves; Werlen, Etienne
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A mass- and heat-exchange device for a distillation column, in particular a cryogenic distillation column, comprises several horizontal layers of stationary ventilators (1A, 1B). The ventilators are stacked in successive horizontal layers within which each deflector forms part of two adjacent ventilators rotating in opposite directions. The layers are formed by the juxtaposition of strips obtained from sheets by cutting and folding and/or bending and/or twisting and are particularly simple to manufacture.
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 November 25, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 25, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 25, 2019.
- 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.