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Expired Canadian patentCanada

Process for cooling a polymerisation reactor

CA 1069677 A · Owner: Chemische Werke Huls Aktiengesellschaft · Inventors: Sistig, Eberhard; Reinermann, Karl-Heinz

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

A process for cooling a polymerization reaction of compounds in dispersion and/or solution in a reactor in which the cooling is effected by evaporation of one or more liquids contained in the reactor condensation of, the vapour in a reflux condenser and recycle of the condensed vapour into the reactor, together with the use of a controllable flow of coolant which is introduced into the reflux condenser jacket. The quantity of heat released on condensation is utilized as the control variable for controlling the coolant inflow to the reflux condenser. Thus the control system can function, virtually without a time lag.

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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 January 15, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 15, 1997.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Filed—
GrantedJanuary 15, 1980
Term endedJanuary 15, 1997
Patent numberCA 1069677 A
Classification (IPC)C08F2/00 +2 more

Timeline

Timeline From CIPO dates

198119831985198719891991199319951997Patent grantedJan 15, 1980Term endedJan 15, 1997

Sources & verification

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