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Expired Canadian patentCanada

Heat exchanger

CA 1111838 A · Owner: Maschinenfabrik Augsburg-Nurnberg Aktiengesellschaft · Inventors: Richter, Dietrich; Heeren, Hermann

CIPO record

Overview

Drawings and full text

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

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Abstract From the Canadian patent

Heat exchangers with heat exchanger elements having a rectangular or square cross section, of the air/tube dry cooling type characterized in, that heat exchanger elements are inclined to horizontal at an angle between 15° and 45° and in that interspaces formed as a result are of V-shaped or inverted V-shaped cross section and serve to accommodate pipes carrying fluid to be recooled or to handle and deliver fluid to be recooled directly said V- or, inverted V-shaped interspaces in the latter case are lined.

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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 November 3, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 3, 1998.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJuly 10, 1979
GrantedNovember 3, 1981
Term endedNovember 3, 1998
Patent numberCA 1111838 A
Classification (IPC)F28D1/00 +2 more

Timeline

Timeline From CIPO dates

1980198219841986198819901992199419961998Application filedJuly 10, 1979Patent grantedNov 3, 1981Term endedNov 3, 1998

Sources & verification

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