Reclosable zipper with tamper evident feature
CA 2136285 C · Owner: Minigrip, Inc. · Inventors: Share, Lawrence; Machacek, Zdenek
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A plastic bag having a reclosable plastic zipper is provided with a tamper-evident, non-reclosable peel seal formed by coextruding an adhesive onto a side strip adjacent to the interlocking zipper. The coextrusion causes the adhesive to preferentially adhere to the side strip when the peel seal is broken. A method for manufacturing the reclosable plastic zipper includes the steps of coextruding a zipper profile including a plane area with an adhesive on the plane area, slitting the profile lengthwise and folding, lover one of the resulting sides of the zipper to interlock them with one another.
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 22, 1994 and granted April 11, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 22, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 22, 2016.
- 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.