Method of manufacturing of steel sheet for easy open end can with superior openability
CA 1251955 A · Owner: Toyo Kohan Co. Ltd. · Inventors: Fukumoto, Ryoichi; Shimizu, Keiichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for manufacturing steel sheet for easy open end cans superior in openability comprising an improvement in the conventional process which includes the steps of hot rolling, first cold rolling annealing and second cold rolling. The improvement resides in the operation of the second cold rolling reduction acording to the formula: 100-0.08x(C+1,000xP)- 0.8xH>R>20 and 45>R. This formula expresses the relationship between hardness, carbon content and cleanliness after annealing, wherein R: second cold reduction (%); C: carbon content after annealing (ppm); P: cleanliness after annealing (d60x400...%) H: hardness after annealing (Hr 30T).
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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 April 4, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 4, 2006.
- 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.