Manufacture of draw-redraw cans using steel sheet material film laminated or extrusion coated with a high density polyethylene graft copolymer
CA 1163875 A · Owner: The Dow Chemical Company · Inventors: Marcus, Stanley A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The use of organic-solvent-based coating compositions in the preparation of plastic coated steel feedstock for use in the manufacture of retortable draw-redraw food and beverage cans is substantially reduced or eliminated by using as such can feedstock a laminated or extrusion coated steel sheet having adhered to at least one, and preferably to both major planar, surface(s) thereof a layer of an adhesive synthetic thermoplastic resin composition having a crystalline melting point of at least about 121°C and comprising graft copolymer of high density polyethylene with an ethylenically unsaturated carboxylic acid monomer.
Read the whole patent
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 March 20, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 20, 2001.
- 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.