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Expired Canadian patentCanada

Method and apparatus for determining the properties of cellulose pulp

CA 1207554 A · Owner: Mo Och Domsjo Aktiebolag · Inventors: Malmgren, Kjell A.

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Abstract From the Canadian patent

Method and Apparatus for determining cellulose-pulp properties A B S T R A C T, A multiplicity of cellulose-pulp properties (for example kappa number) are based on measurement of the weight of the cellulose pulp. Since during the manufacturing process pulp comprises a liquid suspension, it is normally necessary to treat the extracted samples, including a drying stage prior, to weighing the sample and subjecting the same to subsequent analysis. In order not to change the pulp from a chemical and/or physical aspect, the pulp should be dried carefully which takes a long time. As a result of the invention it is possible to exclude the time-consuming drying and weighing operations, and the …

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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 July 15, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 15, 2003.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJune 13, 1983
GrantedJuly 15, 1986
Term endedJuly 15, 2003
Patent numberCA 1207554 A
Classification (IPC)G01N21/84 +2 more

Timeline

Timeline From CIPO dates

1984198619881990199219941996199820002002Application filedJune 13, 1983Patent grantedJuly 15, 1986Term endedJuly 15, 2003

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