Method for producing regular grain oriented electrical steel using a single stage cold reduction
CA 2107372 C · Owner: Gaudino, Francesco · Inventors: Schoen, Jerry W.; Gaudino, Francesco
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention produces a regular grain oriented electrical steel using a single cold reduction step having excellent and highly uniform magnetic quality. The method includes the steps of providing an electrical steel band having Mn of 0.024% or less in excess of that needed to combine with S and/or Se. The band is provided with an anneal at a temperature of from 900-1125°C (1650-2050°F) for a time up to 10 minutes and slowly cooled to 480-650°C (900-1200°F) followed by rapid cooling to a temperature below 100°C (212°F). The annealed band must have a critical amount of austenite .gamma.1150°C, of 7% or, more. The annealed band is cold reduced in a single stage to the desired final …
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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 September 30, 1993 and granted January 12, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 30, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 30, 2015.
- 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.