Direct-current electrical heat-treatment of continuous metal sheets in a protective atmosphere
CA 1079367 A · Owner: Valjim Corporation · Inventors: Dolan, James J.; Janatka, Vladimir
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The heat treatment of a continuous band or sheet of metal as the same travels through a plurality of stages in a protective atmosphere between, conveying rollers, by applying direct-current electricity to the rollers for inclusion of the travelling sheet in the circuit therebetween. The charged rollers in the initial stage are spaced more widely from one another than those in the later stage, to compensate for the lower resistivity of the metal in the former, so that Joule effect or I2R factor in the stages are substantially equalized. The protective atmosphere of oxidizing reducing or inert gases, which encompasses the sheet is confined in chambers of galvanized iron sheeting and the like, …
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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 June 10, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 10, 1997.
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Timeline
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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.