Heat pump
CA 2059815 C · Owner: Ontario Hydro Financial Corporation · Inventors: Lenarduzzi, Frank J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A ground source heat pump comprising an indoor coil circuit and an outdoor coil circuit utilizes a scroll compressor to pressurize the refrigerant. The outdoor coil may comprise ground coils formed from copper tubing into a spiral configuration. A charge control device controls the volume of refrigerant in the system in heating and cooling modes. A restrictor in parallel with a thermal expansion valve permits a base flow of refrigerant into the outdoor coil in heating mode. An accumulator is provided with a level switch controlling a solenoid valve connected in parallel to a thermal expansion valve feeding the indoor coil. The scroll compressor includes a discharge port operating in …
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 January 22, 1992 and granted August 12, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 22, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 22, 2014.
- 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.