Process and mechanism to empty pulping digester
CA 2025454 C · Owner: Beloit Corporation · Inventors: Andrews, Ethan K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process and mechanism for cooking fibrous paper pulp including a digester wherein the pulp is cooked under elevated temperatures and pressures for a predetermined time a, discharge line leading form the lower end of the digester to a blow tank, a valve in the discharge line and cycling means connected to the valve cyclically opening and closing the valve while the contents are emptied from the digester.
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 14, 1990 and granted December 14, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 14, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 14, 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.