Method of selecting wood for chemical pulping
CA 2371519 A1 · Owner: Walker, John Corrie Fleming · Inventors: Walker, John Corrie Fleming
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of selecting bulk wood units for chemical pulping in alkaline conditions which, consists of establishing a reference scale by selecting a test sample measuring the acoustic, velocity through each sample units selecting acoustic velocity bands from the sample results, processing the sample units using known chemical pulping processes measuring , the, percentage pulp yield and then using the measured pulp yields and acoustic velocities to, produce a reference scale; measuring the acoustic velocity through each of the units, comparing the velocity measurement for each unit against the reference scale and then, dividing the tested units into subgroups according to the predicted …
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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 February 13, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 13, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 13, 2024.
- 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.