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Expired Canadian patentCanada

Corrosion inhibition of closed cooling water auxiliary system for nuclear power plants and other applications

CA 1339292 C · Owner: Pacific Gas And Electric Company · Inventors: Burda, Paul A.

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Abstract From the Canadian patent

A potassium inhibitive blend and corrosion protection method of closed cooling water systems. The closed cooling system circulates about 35 to 40 gallons of corrosion inhibitor per 10,000 gallons of circulating water. The corrosion inhibitor contains potassium molybdate, potassium nitrite, and potassium borate in an aqueous solution so that if leakage of the circulated water occurs, the leaked corrosion inhibitive liquid does not cause dangerous radiation in any amounts dangerous to the environment. The potassium molybdate and potassium nitrate each constitute about 12% of the aqueous solution. Potassium based borate at 2 to 2.5% ethylene glycol, preferably at about 10% and benzotriazole …

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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 August 19, 1997. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 19, 2014.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledFebruary 21, 1989
GrantedAugust 19, 1997
Term endedAugust 19, 2014
Patent numberCA 1339292 C
Classification (IPC)C23F11/18 +2 more

Timeline

Timeline From CIPO dates

199019931996199920022005200820112014Application filedFeb 21, 1989Patent grantedAug 19, 1997Term endedAug 19, 2014

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