Wedge zipper
CA 2175286 C · Owner: Tilman, Paul A. · Inventors: Tilman, Paul A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A reclosable bag is formed of walls defining a closure with a mouth. The closure includes a male profile extending along an internal surface of one of the walls and a female profile adapted to interengage with the male profile and extending along an internal surface of the other wall. The male and female profiles are extruded from a polymeric resin. At least one of the male and female profiles includes at least one rib of another polymeric material coextruded therewith and extending longitudinally therealong. The polymeric material of the rib has a lower melting point than the polymeric material of the profiles so that it, will melt when a side seal is made transversely across 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
- Filed April 29, 1996 and granted December 26, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 29, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 29, 2018.
- 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.