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Expired Canadian patentCanada

Method to dewater pulp for paper with simultaneous formation of sheet in a two-wire system, and plant which employs such method

CA 1283572 C · Owner: Cartificio Ermolli S.P.A. · Inventors: Corbellini, Glauco

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Abstract From the Canadian patent

Method to dewater pulp for paper with simultaneous formation of sheet in a two-wire system which can be applied, to vertical or horizontal wires the wires (11-12) being able, to move continuously under tension and to receive pulp (27) continuously from a stock inflow tank (28) in which method a, layer of pulp (33) moving lengthwise is subjected at once to an action of progressive mechanical compression of a desired algorithm and to an action of aspiration of the water and, only of the water, at a constant value owing to a siphon effect. The invention is embodied with devices suitable to carry out such method and with plant employing such method.

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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 30, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 30, 2008.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledAugust 7, 1987
GrantedApril 30, 1991
Term endedApril 30, 2008
Patent numberCA 1283572 C
Classification (IPC)D21F9/00 +1 more

Timeline

Timeline From CIPO dates

1988199119941997200020032006Application filedAug 7, 1987Patent grantedApril 30, 1991Term endedApril 30, 2008

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.