Tamper evident closure
CA 2362323 A1 · Owner: Thermotic Developments Limited · Inventors: Searle, Matthew John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A beverage container (10) has a base member (16) indented to define an elongate external cavity (20). To provide a self-heating can the cavity (20) , is filled with quicklime and closed by a closure (30) which contains water. If the closure (30) is opened with the can inverted water flows over the , quicklime to cause an exothermic reaction. To provide evidence that the closure (30) has been operated to cause self-heating the internal surface of , a lid (34) is coloured and/or provided with a bold pattern. The material of part of the closure (30) is transparent and the contained water is coloured. For example, the water is red and the surface of the lid (34) is blue. In the initial …
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 February 11, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 11, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 11, 2022.
- 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.