Striped film and apparatus and method
CA 2050026 C · Owner: Cryovac, Inc. · Inventors: Havens, Marvin R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Striped films of the invention can have two or more preferably polymeric layers, of which at least one continuous or discontinuous layer includes a pigmented resin. The striped film is produced by modifying conventional coextrusion dies to restrict the flow of a pigmented melt stream. The result is a striped film useful for identifying the contents of a package made from the film tamper , evidence, counterfeit protection and verification of properties. The stripes can be of one or more colors and vary in width, and spacing. The pigment can be a material visible in ordinary light, or a material invisible in ordinary light but visible in e.g. ultraviolet light.
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 27, 1991 and granted April 17, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 27, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 27, 2013.
- 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.