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Expired Canadian patentCanada

Compact primary surface heat exchanger

CA 1069883 A · Owner: Caterpillar Tractor Co. · Inventors: Dawson, Harry J.; Robinson, Ronald R.; Mangus, Ervin E.

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

A compact primary surface heat exchanger is disclosed which includes a plurality of transversely corrugated sheets arranged in a stack in superimposed crest-to-crest askewed bridging relation to define first and second serpentine fluid flow paths alternately between them, and with each of the sheets having a plurality of repetitive transverse convolutions which are so constructed as to provide a plurality of substantially vertically extending and substantially parallel walls with an integrally joining plurality of crest members to provide an effective heat exchanger with a decreased number of sheets.

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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 1069883 A
Classification (IPC)F28F3/02 +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.