System and process for gas recovery
CA 2430812 A1 · Owner: Praxair Technology, Inc. · Inventors: Jaynes, Scot Eric
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is directed to a three stage process for recovering and purifying a gas, such as contaminated helium from a cold spray coating process, and a system for using the three stage process. The steps include a) introducing a gas from a chamber to a particulate removal apparatus to form a particulate-free gas, and recycling a first portion of the particulate-free gas to the chamber; b) passing a second portion of the particulate-free gas to a first compressor prior to passing a selective gas purification membrane to form a purified gas and a exhaust gas, and passing the purified gas to mix with the first portion of particulate-free gas to the chamber; and c) passing a third …
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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 November 9, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 9, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 9, 2023.
- 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.