Variable capacity type viscous heater
CA 2209118 C · Owner: Kitani, Fumihiko · Inventors: Hirose, Tatsuya; Moroi, Takahiro; Yagi, Kiyoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A variable capacity viscous heater whose capacity is reliably decreased and whose heating efficiency does not lower even after a long term use. Formed are, for example, a recovery passage (3a) communicating with the central area of a heating chamber (10) and capable of being opened and closed a supply , passage (3c) communicating with the lower portion of the heating chamber (10) and a control chamber (CR) communicating with the recovery passage (3a) and the supply passage (3c). Silicone oil in the heating chamber (10) is recovered by use of the Weissenberg effect into the control chamber (CR) through the recovery passage (3a), which is open, to decrease the capacity. Silicone oil in …
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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 October 31, 1996 and granted July 25, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 31, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 31, 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.
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.