Composite steel sheet having high workability for drawn and ironed cans
CA 2023893 A1 · Owner: Hayashi, Tomohiko · Inventors: Hayashi, Tomohiko; Oyagi, Yashichi; Nishida, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composite steel sheet is provided as a material for drawn and ironed cans. The composite steel sheet of the present invention comprises a polyester resin film at least on one side thereof the resin film, being a polyester resin film having one or both of heat of cold crystallization (Hc) of 7 cal/g or less and heat of fusion (Hf) of 10 cal/g or less; density of 1.370 g/cm or less; and weight-average molecular weight of 70,000 or less. The can formed from the composite steel sheet of the present invention may be used with a single coating on the internal face of the can, and even without a coating depending on the content to be filled in the can. Accordingly, the composite steel sheet of …
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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 August 23, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 23, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 23, 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.