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Expired Canadian patentCanada

Corrosion control composition and method for boiler/condensate stem system

CA 1339761 C · Owner: Betz Laboratories, Inc. · Inventors: Mcdonald, Alexandre C.; Rossi, Anthony M.

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Abstract From the Canadian patent

A corrosion control composition and method for boiler/condensate steam systems is provided. Corrosion is controlled by the addition to the feedwater of a relatively high molecular weight amine. The high molecular weight amine is formulated so that at the conditions of temperature and pressure in the boiler/condensate steam system partial degradation into more volatile amines occurs. The resulting blend of neutralizing amines provides the superior corrosion control of a blend of neutralizing amines from a single amine feed. The preferred high molecular weight amine is dimethylaminopropylamine which will partially degrade into dimethylamine trimethylamine, methylamine, and …

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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.

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  • Granted March 24, 1998. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 24, 2015.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 18, 1989
GrantedMarch 24, 1998
Term endedMarch 24, 2015
Patent numberCA 1339761 C
Classification (IPC)C23F11/14 +1 more

Timeline

Timeline From CIPO dates

199019931996199920022005200820112014Application filedApril 18, 1989Patent grantedMarch 24, 1998Term endedMarch 24, 2015

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