Apparatus for heating a fluid
CA 2083370 C · Owner: Walker, Ross Joseph Harold · Inventors: Bodger, Patrick Selwyn; Walker, Ross Joseph Harold
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A main-frequency electrically powered fluid heater which includes a coreless transformer and an electrically conductive jacket through which flows the fluid to be heated; the coreless transformer comprises a primary winding electrically insulated from the jacket but at least partially surrounding it, and a secondary winding arranged so as to be linked by magnetic flux from the primary winding; secondary winding being electrically insulated from the primary winding, but electrically connected to the jacket, so that the jacket is heated both by resistance heating and by eddy current heating.
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 May 23, 1991 and granted December 7, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 23, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 23, 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.