Tamper evident closure
CA 2002940 A1 · Owner: Lawson Mardon (M.I.) Limited · Inventors: Dudzik, Henryk
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A screw cap 10 comprising an internally threaded skirt 14 including a frangible indicator 22 having a projection 30 adapted to be engaged by a projection 40 on the neck 20 of the jar 12 as the cap is rotated to remove it. Pressure applied by the projection 40 causes frangible supports 26 to snap and the indicator 22 to break thus, providing an indication (both visual and tactile) that the jar has previously been opened. The cap can be made and applied to a jar by currently used systems and is a little more expensive than a conventional cap.
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 November 14, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 14, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 14, 2011.
- 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.