A machine for winding film, a method of making spools of pre-stretched film, and spools of pre-stretched film obtained thereby
CA 2237042 C · Owner: Thimaix · Inventors: Martin-Cocher, Jean-Paul; Jaconelli, Georges
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates mainly to a machine for winding film, to a method of manufacturing spools of pre-stretched film, and to spools of pre-stretched film obtained thereby. The method of winding spools of pre-stretched stretchable film of the invention includes importing oscillation to the film, advantageously with a component perpendicular to the axis of the film. For example, during pre-stretching and winding of the film on a take-up spool, a feed spool, i.e. a spool from which the stretchable film for stretching is taken is caused, to oscillate, and/or the take-up core is caused to oscillate. This ensures that successive layers of film are offset, in particular at the margins of …
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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
- Filed May 6, 1998 and granted November 5, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 6, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 6, 2020.
- 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.