Process and device for measuring displacement rates of a web running through a multi-colour rotary printing press
CA 2021163 A1 · Owner: Bobst S.A. · Inventors: Roch, Roger H.; Monney, Patrick; Stern, Nathan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method and product for measuring the displacement of a web (110) within a multi-colour rotary printing press by means of a mark simultaneously printed with each colour and placed so as to run through under photoelectric detectors for generating signals, the result of the combination of which is representative of the lateral displacement. This process comprising: - arranging above the web (110) two laterally adjacent photoelectric detectors (130, 135) with their common edge situated on the centre of the expected passage of a laterally symmetrical mark (120), and, - deducing the lateral displacement of the web (110) from the difference between the intensity variation (d1 d2) of, the signals …
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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 July 13, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 13, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 13, 2012.
- 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.