Explosion pulping
CA 2025522 A1 · Owner: Hornsey, Derek · Inventors: Hornsey, Derek; Lee, Robert G. H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In an explosion pulping process an inert gas is injected into the steamed pulp prior to explosion, to raise the pressure; the resulting exploded pulp displays improved mechanical properties and requires less refining time and refining energy. By employing lime in a presoaking treatment and carbon dioxide in the inert gas, deposits of calcium carbonate are formed on the fibres, providing improved brightness characteristics.
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 17, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 17, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 17, 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.