Dulled stretched molding and process for producing the same
CA 2012729 C · Owner: Ishibashi, Tadao · Inventors: Yamada, Kazuhiro; Ishibashi, Tadao; Kuroda, Takashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The disclosed dulled stretched molding of at most 30 % in gloss value, which is useful as a general-purpose packaging material, printing paper, tracing paper etc. is produced from a composition comprising 100 parts by weight of a propylene-ethylene block copolymer and 3 to 40 parts by weight of a cyclopentadiene type petroleum resin having a ring and ball softening point of at least 160 °C through melt extrusion thereof and stretching of the resulting flat extrudate. There also is disclosed a heat-shrinkable foamed molding of at most 0.8 g/cm3 in density and at least 10 % in heat shrinkability at 100 °C, which is useful as a packaging material, a tying material, a label material etc. This …
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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 March 21, 1990 and granted May 20, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 21, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 21, 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
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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.