Article having a coextruded polyester support film
CA 1074073 A · Owner: Minnesota Mining And Manufacturing Company · Inventors: Roelofs, Glenn E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
It is known to prepare laminated films of polymeric material which are useful in splicing materials together. Generally such materials are, prepared by hot-melt coating emulsion coating or solvent coating a polyester material on the surface of a biaxially oriented polymeric film. However such products tend to delaminate. The present invention seeks to overcome this drawback by providing composite coated sheet material especially suited for use as a splicing tape in the method defined in claim 1, comprising, in combination:, (1) a biaxially oriented and heat-set coextruded support film comprising (a) a base layer of highly dimensionally stable crystalline thermoplastic polyester having a …
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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
- Granted March 25, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 25, 1997.
- 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.