Method for removing, condensing and collecting propellants from foam materials and other materials for which the method is suitable in an environmentally friendly manner
CA 2064909 A1 · Owner: Voers, Lau Ove · Inventors: Voers, Lau Ove
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for removing condensing and collecting propellants, e.g. chlorofluoro-carbons (CFCs) in an environmentally friendly manner from foam materials, e.g. insulant materials from old (discarded) refrigerators, district heating tubes and other materials for which the method is suitable. The method is based on the fact that the decomposition of the foam materials and accordingly the liberation of the propellant in the foam takes place in a liquid medium, e.g. water. In case the temperature of the liquid medium is equal to or above the temperature corresponding to the boiling point of the propellant at the actual pressure the propellant is , liberated from the foam as a gas. The propellant …
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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 August 17, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 17, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 17, 2012.
- 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.