Improved air-to-air heat pump
CA 2312175 A1 · Owner: Grenier, Joseph Antoine Michel · Inventors: Grenier, Joseph Antoine Michel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An air-to-air heat pump having two compressors in parallel in the refrigerant circuit with one being a high temperature low volume compressor that operates in both the heating and cooling mode and the other a low temperature high volume compressor that operates by itself in the heating mode of the heat pump when the ambient air temperature drops below a selected value of about 20 degree F.
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 June 23, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 23, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 23, 2022.
- 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.