Patents Assigned to Grace Dearborn Inc.
  • Condensate polisher regenerant system
    Patent number: 5389261
    Abstract: High pressure boiler condensate returns are polished and softened with a macroreticular cation exchange resin, and the resin is regenerated with a readily ionizable organic acid salt of a relatively low volatility amine corrosion inhibitor.
    Type: Grant
    Filed: August 31, 1993
    Date of Patent: February 14, 1995
    Assignee: Grace Dearborn Inc.
    Inventors: John Daly, Ronald Oleka
  • Use of cationic alkyl-phosphonium salts as corrosion inhibitors in open recirculating systems
    Patent number: 5314660
    Abstract: A method for inhibiting corrosion of metals which are in contact with an aqueous system comprising adding to the system, either alone or in combination with organic or metal containing water treatments, a water-soluble cationic alkyl-phosphonium salt in an amount effective to inhibit corrosion.
    Type: Grant
    Filed: January 28, 1993
    Date of Patent: May 24, 1994
    Assignee: Grace Dearborn Inc.
    Inventors: Brian E. Clark, Ronald L. Oleka