Method and apparatus for treating cellulosic products
CA 1165641 A · Owner: Old North Manufacturing Company, Inc. · Inventors: Edwards, Ben E.; Marr, Clyde M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for impregnating low density fiberboard with asphalt is disclosed and which, includes stacking the sheets placing the stacks in a, sealable chamber and flooding the chamber with a, treating solution composed of a mixture of asphalt and solvent. The chamber is thereafter drained and the, fiberboard is then heated by the injection of live steam into the chamber. A partial vacuum is then drawn in the chamber, while condensing and separating the withdrawn solvent and water vapors. Both the condensed solvent and water of the steam injection system are maintained in closed conduit systems to permit their reuse and to prevent contamination of the environment.
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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
- Granted April 17, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 17, 2001.
- 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.