Method and apparatus for determining at least one sheet stretch value of a roll of material
CA 2200228 C · Owner: Recherche D.C.B.L. Inc./D.C.B.L. Research Inc. · Inventors: Laplante, Benoit
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There are provided a method and an apparatus for determining at least one sheet stretch value of a roll of material (2). The method comprises the steps of (a) radially marking one side end of the roll (2) from periphery thereof to produce a series of aligned marks (4) along a radius thereof; (b) supporting the roll (2) in such a manner that it is free to rotate thus allowing , relaxation of peripheral layers thereof; and (c) after steps (a) and (b) measuring a lateral shifting value GAP of one of the marks (10) which is the , outermost in periphery of the roll (2) with respect to an adjacent mark (16).
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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 September 14, 1995 and granted June 13, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 14, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 14, 2017.
- 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.