Heating device for sheet material
CA 2188251 C · Owner: Rohm Co. Ltd. · Inventors: Tanaka, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A heating device (1) according to the present invention includes a substrate (2) made of a heat-resistant insulating material, a heating resistor layer (3) formed on the substrate (2) and a protective layer (6) formed on the substrate (2) to cover the heating resistor layer (3). The protective layer (6) is formed of glass to which alumina powder having a grain size of no greater than 5 µm is added. The addition proportion of alumina powder is 3-30Wt%, preferably 3-22Wt% and particularly 10-22Wt%. The addition of alumina powder remarkably increases the dielectric strength of the protective layer (6).
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 March 25, 1996 and granted November 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 25, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 25, 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.