Process and apparatus for forming integral interlocking closure film stock
CA 1231508 A · Owner: First Brands Corporation · Inventors: Dorsey, Robert T.; Scheibner, Gerald H.; Henderson, William E. (Deceased)
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, A process and apparatus for producing integral interlocking closure film stock useful in making reclosable containers by extruding a film of molten thermoplastic material onto a casting roll extruding closure elements to contact and join said film at a point between about one inch and about five inches prior to the tangency line of the film on the periphery of the casting roll, partially cooling the closure elements with water starting at a point about one inch below the extrusion exits of the closure elements, and further cooling the closure elements by directing them past additional cooling assemblies. Stripping means are employed to remove water from the cooled integral …
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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 January 19, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 19, 2005.
- 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.