Method and apparatus for measuring properties of paper
CA 2300095 A1 · Owner: Kansakoski, Markku · Inventors: Hyvarinen, Timo; Tenhunen, Jussi; Kansakoski, Markku
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method and an apparatus for measuring the properties of paper from a moving paper web in a paper machine. An infrared beam (2) is directed to the paper web (4). The infrared beam (2) passed , through or reflected from the paper web (4) is split into wavelength , components with a spectrograph (5) and signals of the different wavelength components are measured, and the properties of paper are determined on the basis of the signals.
Read the whole patent
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 15, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 15, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 15, 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
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.