Opaque oriented polymeric film structure and method of preparing same
CA 2033274 C · Owner: Mobil Oil Corporation · Inventors: Swan, Larry Gene; Wood, Ronald Clark, Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
1. An opaque, biaxially oriented polymeric film structure comprising:, (a) a core layer, having a first surface and a second surface, comprising a thermoplastic polymeric matrix within which is located a stratum of voids; a substantial number of the voids containing at least one spherical, void-initiating particle which is phase distinct and incompatible with matrix material the, population of voids in the core being such as to cause a significant degree of opacity; and, (b) at least one skin layer adhering to at least the, first surface of the core layer comprising a thermoplastic, polymeric matrix within which is located a stratum of voids a, substantial number of said voids containing at …
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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 December 27, 1990 and granted August 17, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 27, 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.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.