Liquefying and storing a gas
CA 2585356 C · Owner: Respironics, Inc. · Inventors: Powell, Douglas R.; Dickerson, Brian E.; Delve, Steve W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus and methods for improving the safety and efficiency and decreasing the cost of , producing liquid oxygen with a small-scale use liquefaction device according , to various , embodiments of the present invention. In one embodiment a switch (666) is , electrically , coupled to a storage dewar pressurizing means (646) the switch (666) , positioned to be , activated by a portable dewar (668) upon engagement of portable dewar (668) with storage , dewar (620). Cryocooler (602) and/or cooling fan (3203 3208) enter low power , mode when , dewar (120) liquid level reaches a predetermined level and return to a full , power mode when dewar (120) liquid level drops to another predetermined …
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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 October 25, 2005 and granted October 22, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 25, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.