Refrigeration system
CA 2188402 C · Owner: Coventry, Andrew · Inventors: Coventry, Andrew
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A refrigeration system (12), comprising three expansion units (19A, 19B, 19C) connectable, in parallel via respective conduits (30) to a supply (16), of compressed refrigerant. Each expansion unit comprises an, expansion chamber (22) and three series connected secondary, chambers (24 26 and 28). The, expansion chamber (22) and secondary chambers (24, 26 and, 28) are formed with progressively reducing volumetric capacity. The end of each of the third secondary chambers (28), distant, from their respective second secondary chambers (26) is, connected to a common bleed tube (29) having a bleed hole, (34) for venting the refrigerant. The bleed hole (34) opens on the outside of a housing (15) …
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 April 21, 1995 and granted July 15, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 21, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 21, 2017.
- 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.