Expired Canadian patentCanada
Cryogenic rectification system with nitrogen turboexpander heat pump
CA 2193292 C · Owner: Drnevich, Raymond Francis · Inventors: Prosser, Neil Mark; Drnevich, Raymond Francis
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cryogenic rectification system which can operate at elevated pressure without encountering a severe separation efficiency burden wherein additional column reflux is generated by an indigenous nitrogen heat pump circuit.
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 December 18, 1996 and granted February 22, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 18, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 18, 2018.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 18, 1996
GrantedFebruary 22, 2000
Term endedDecember 18, 2016
Patent numberCA 2193292 C
Classification (IPC)F25J3/02 +1 more
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.