Thermistor and method of making the same
CA 2019331 C · Owner: Burke, Francis M. · Inventors: Burke, Francis M.; Buchanan, William L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of making a thermistor comprising the steps of making a layer of thermistor ceramic material comprised substantially of Mn2O3 NiO, Co3O4, Al2O3, CuO, or Fe2O3, having upper and lower surfaces. A first dielectric material comprised of low K Al2O3 or the like is placed on the upper and lower surfaces of the layer, and then is cut into a plurality of elongated strips. The layer is created by blading a slurry of the ceramic material to create a plurality of uncured sheets; placing the sheets in superimposed position, and then making the monolithic layers from the sheets by applying heat and pressure thereto, and then firing the monolithic layer with heat of increased magnitude. The …
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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 June 19, 1990 and granted January 21, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 19, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 19, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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.