Improved pulp washing method
CA 2258962 A1 · Owner: Antkowiak, John S. · Inventors: Antkowiak, John S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a pulp washing method which employs a dilution stage (42) followed by an , extraction stage (44) and followed, in turn, by a displacement stage (46) filtrates from the extraction stage (1) and the displacement stage (2) are segregated so that at least a part of the filtrate from the extraction stage may be removed from the pulp washing.
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 April 29, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 29, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 29, 2019.
- 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.