Methods and apparatus for injection molding and injection blow molding multi-layer articles and the articles made thereby
CA 1256257 A · Owner: American National Can Company · Inventors: Vella, John, Jr.; Kudert, Frederick G.; Mchenry, Robert J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a method of forming multi-layer plastics articles employing a multi-cavity injection molding machine a combined, material stream is injected from each of a plurality of coinjection nozzle means of the machine into an associated injection cavity to form each article. The method further involves providing streams of polymeric materials to form the corresponding layers of the articles, and moving each material stream separately to each of the nozzle means forming the, combined stream in the plural nozzle means from the separate material streams, and injecting the combined streams to form the multi-layer plastics articles.
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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 June 27, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 27, 2006.
- 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
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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.