Method and composition for preventing pitch deposits in paper mills using resinous mechanical pulps
CA 2291882 A1 · Owner: Champine, Jeffrey N. · Inventors: Dreisbach, David D.; Champine, Jeffrey N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is a method and composition for preventing the deposition of contaminants from resinous pulp and/or recycled pulp in the press section, of a pulp and paper process. The composition of the invention includes a cleaning, solvent comprising a blend of aromatic hydrocarbons containing between nine and eleven, carbon atoms and a surfactant comprising an alcohol ethoxylate. The composition of the, invention can be applied to the felts in the press felt section of a pulp and paper process to, break down and loosen deposited contaminants and the contaminants can be removed, thereby preventing the need for batch cleaning and downtime in the press felt section.
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 December 1, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 1, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 1, 2021.
- 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.