Heater for liquid
CA 2056064 C · Owner: Heatrae Sadia Heating Limited · Inventors: Hammond, Brian William
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A heater for liquid comprises a vessel having an inlet for cold liquid and an outlet for hot liquid, an electrically operated valve means to control the flow of liquid into the vessel through the inlet and a heating means to heat the liquidin the vessel first control means operative for controlling the liquid level in the vessel, the first control means comprising a level sensor to which the first control means responds by maintaining the electrically operated valve means closed when the level of liquid in the vessel reaches an upper limit the heaterhaving a second control means operable independently from the first control means, the second control means including a temperature sensor to …
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 November 22, 1991 and granted June 8, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 22, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 22, 2013.
- 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.