Gas gate for isolating regions of differing gaseous pressure
CA 2514858 C · Owner: Doehler, Joachim · Inventors: Doehler, Joachim; Cannella, Vincent
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed herein is an improved gas gate for interconnecting regions of differing gaseous composition and/or pressure more particularly between , atmosphere and a vacuum. The gas gate includes a cylinder within a housing situated between the regions of differing gaseous pressure. A web of substrate material is adapted to move between the regions with at least one roller in the first region and at least one roller in the second region. The rollers are positioned to create sufficient tension as the web advances over the top peripheral portion of the cylinder between the two regions or under the bottom peripheral portion of the cylinder between the two regions. In an exemplary …
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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 February 4, 2004 and granted January 3, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 4, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 4, 2026.
- 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.