Resin-coated steel sheet for drawn-and-ironed cans and drawn-and-ironed cans manufactured therefrom
CA 2029943 C · Owner: Mitsui Petrochemical Industries, Ltd. · Inventors: Yoshihara, Ryoichi; Niimi, Hiroji; Wake, Ryousuke
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Resin-coated steel sheets which have excellent workability in drawing and ironing even at a normal temperature without preheating, and which give by drawing, and ironing, DI cans having resin coating satisfactory in adhesion, corrosion resistance, and external appearance. The sheets comprise a steel sheet tin-coated on one side and chromate-treated on the other side the chromate-treated, side being further coated with a resin composition composed of a thermoplastic polyester resin prepared by a thermal fusion reaction of 95 to 5 % by weight of a crystalline polyester and 5 to 95 % by weight of non-crystalline polyester and having an alloying ratio of 5, to 50 %. The sheets may be …
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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 November 14, 1990 and granted October 12, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 14, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 14, 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.
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.