Tamper indicating closure
CA 1182428 A · Owner: Sunbeam Plastics Corporation · Inventors: Gach, Peter P.; Bush, Randall G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A tamper indicating closure including an outer cap and an inner liner which relies on relative movement of the outer cap and the inner liner during opening movement to indicate tampering of the container after it has been sealed for the first time, the relative movement being insured by a friction surface which coacts with the inner surface of an opening in the container to resist rotation of the liner and maintain it in a sealed condition while the outer cap is being rotated in an opening direction. Once opened the outer cap and the inner liner are maintained in a position for movement as a unit in both the opening and closing direction of the closure.
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
- Granted February 12, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 12, 2002.
- 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.