Grain-oriented silicon steel and stress coating therefor
CA 1278985 C · Owner: Choby, Edward G. Jr. · Inventors: Choby, Edward G. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improvement in a stress coating composition containing colloidal silica, metal phosphate and hexavalent chromium for application to grain-oriented silicon steels after final high temperature texture annealing to develop tensile stress in the steel is provided by replacing 5 to 50% of said colloidal silica with finely powdered silica to increase the viscosity of the stress coating composition and permit the coating to be applied in a uniform and controlled coating thickness to the silcon steel in strip form.
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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
- Granted January 15, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 15, 2008.
- 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.