Method and apparatus for continuously producing an integrally molded double-sided surface fastener
CA 2097407 C · Owner: Ykk Corporation · Inventors: Murasaki, Ryuichi; Nishiyama, Hissai
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and an apparatus for easily producing a double-sided surface fastener molded integrally in a simple process which provides, easy disengagement in spite of high engaging strength and high durability in repetitive use. A molten resin is extruded from an extrusion nozzle at the predetermined width and is introduced into a predetermined gap between upper and lower die rollers which are disposed up and down with the gap and are provided with a plurality of engine element forming cavities on the respective peripheries and cooling means in the inner portions. The upper and lower die rollers are concurrently driven and rotated in the extrusion direction of the molten resin while filling …
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 May 31, 1993 and granted March 18, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 31, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 31, 2015.
- 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.