Polyester laminated metal sheet
CA 2103523 C · Owner: Miyachi, Akio · Inventors: Miyachi, Akio; Tanaka, Atsuo; Inui, Tsuneo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polyester resin film laminated metal sheet for a retortable can stock having excellent resistance to milky change during retort treatment after packing foods and drinks, is obtained by controlling to the optimum range in a relative ratio of density and a residual degree of biaxial orientation of the laminated biaxially oriented polyester resin film consisting of about 10 to about 60 weight % of polybutylene terephthalate and about to 90 weight % of polyethylene terephthalate having a glass transition temperature of about 40 to about 70°C, in the laminate before retort treatment after lamination to one or both sides of a metal sheet covered with a single layer of hydrated chromium oxide or …
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
- Filed August 6, 1993 and granted January 2, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 6, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 6, 2015.
- 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.