Closure with irreversible color change system
CA 2086828 C · Owner: Continental White Cap, Inc. · Inventors: Heilman, Robert J.; Rozanski, Leonard; Egger, Mark
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This relates to a color change system to be incorporated in a flexing area of an end panel of a closure (10). The color change system includes a dark background coating (40) on a flexing portion (28) of the closure end panel (12) to which there is bonded by way of an adhesive such as a varnish ink or coating a brittle layer , (44) which due to the flipping action of the flexing portion of the end panel will fracture. The brittle layer is preferably of a tight color and is colored utilizing a fluorescent dye. The combination of the background color and the fluorescent color of the brittle layer produces a first color in the original closure and when the end panel flexes and the brittle …
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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 July 3, 1991 and granted March 18, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 3, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 3, 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.