Metal screw closures for packaging containers
CA 2039892 C · Owner: Carnaudmetalbox Plc · Inventors: Collins, Malcolm George
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention discloses a screw closure for a container comprising a metal closure body having a closure panel to overlie the mouth of a container, and a skirt peripherally attached to the closure panel which has a generally cylindrical region on which a screw thread formation is formed or formable for engagement with the container, and which extends beyond the generally cylindrical region to an inward curl which includes the free edge of the closure metal. The closure further includes a plastics security ring which has a top portion held captive by the closure skirt and which extends axially beyond and interiorly of the curl to an integral bottom portion capable of making locked engagement …
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 April 5, 1991 and granted October 19, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 5, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 5, 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.