Patents by Inventor Alexander C. McDonald

Alexander C. McDonald has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Transport and deposit inhibition of copper in boilers
    Patent number: 5158684
    Abstract: This invention relates to a method of transporting and inhibiting the deposition of copper and copper-iron materials on heat transfer devices in steam generating systems. This method utilizes a thermally stable chelant and a carboxylated polymeric dispersant as the treatment agents. Representative chemicals are 1,10-phenanthroline and 9:1 methacrylic acid/acrylic acid copolymer.
    Type: Grant
    Filed: March 12, 1991
    Date of Patent: October 27, 1992
    Assignee: Betz Laboratories, Inc.
    Inventors: Roger D. Moulton, Alexander C. McDonald, James L. Soos
  • Corrosion inhibitors for ferrous metal in aqueous solutions comprising a nonionic surfactant and an anionic oxygen containing group
    Patent number: 5139701
    Abstract: A composition and method for controlling corrosion of steel in aqueous systems such as cooling and boiler systems. The combination of a nonionic surfactant and an anionic oxygen containing group such as one or more alkali metal salts of borate, molybdate and nitrate/nitrite provide improved corrosion inhibition of steel in aqueous systems. The magnetite layers formed in the presence of this combination exhibit decreased porosity and increased corrosion resistance to acidic solutions. This combination also inhibits entry of hydrogen into steel when exposed to acidic solutions thereby inhibiting hydrogen embrittlement. The preferred nonionic surfactant is phenol/polyethylene oxide nonionic surfactant and the preferred alkali metal salt is Na.sub.2 MoO.sub.4.
    Type: Grant
    Filed: July 22, 1991
    Date of Patent: August 18, 1992
    Assignee: Betz Laboratories, Inc.
    Inventor: Alexander C. McDonald
  • Method of inhibiting deposition on heat transfer surfaces in boilers
    Patent number: 5108619
    Abstract: This invention relates to a method of controlling deposition in steam generating systems. This method utilizes poly(methacrylic) acid polymers that were initiated by benzoyl peroxide or lauroyl peroxide as the treatment agents.
    Type: Grant
    Filed: January 18, 1991
    Date of Patent: April 28, 1992
    Assignee: Betz Laboratories, Inc.
    Inventors: Alexander C. McDonald, Fu Chen, William S. Carey
  • Corrosion inhibitors for ferrous metals in aqueous solutions comprising a nonionic surfactant and an anionic oxygen containing group
    Patent number: 5082592
    Abstract: A composition and method for controlling corrosion of steel in aqueous systems such as cooling and boiler systems. The combination of a nonionic surfactant and an anionic oxygen containing group such as one or more alkali metal salts of borate, molybdate and nitrate/nitrite provide improved corrosion inhibition of steel in aqueous systems. The magnetite layers formed in the presence of this combination exhibit decreased porosity and increased corrosion resistance to acidic solutions. This combination also inhibits entry of hydrogen into steel when exposed to acidic solutions thereby inhibiting hydrogen embrittlement. The preferred nonionic surfactant is phenol/polyethylene oxide nonionic surfactant and the preferred alkali metal salt is Na.sub.2 MoO.sub.4.
    Type: Grant
    Filed: July 2, 1990
    Date of Patent: January 21, 1992
    Assignee: Betz Laboratories, Inc.
    Inventor: Alexander C. McDonald
  • Boiler water treatment
    Patent number: 4952324
    Abstract: A method for treatment of boiler waters is disclosed. The method comprises a synergetic combination of ametacrylic acid-containing polymer with a strongly interacting nonionic surfactant, together with a chelant and/or a phosphate-generating species. The method is particularly effective when the surfactant is an alkoxylated alkylphenol or an alkoxylated alkylphenol ether.
    Type: Grant
    Filed: February 21, 1989
    Date of Patent: August 28, 1990
    Assignee: Betz Laboratories, Inc.
    Inventors: Alexander C. McDonald, James L. Soos
  • Boiler water treatment composition
    Patent number: 4931206
    Abstract: A composition for treatment of boiler waters is disclosed. The composition comprises a synergetic combination of a methacrylic acid-containing polymer with a strongly interacting nonionic surfactant, together with a chelant and/or a phosphate-generating species. The composition is particularly effective when the surfactant is an alkoxylated alkylphenol or an alkoxylated alkylphenol ether.
    Type: Grant
    Filed: February 21, 1989
    Date of Patent: June 5, 1990
    Assignee: Betz Laboratories, Inc.
    Inventors: Alexander C. McDonald, James L. Soos
  • Boiler water treatment
    Patent number: 4828713
    Abstract: A method for treatment of boiler waters is disclosed. The method comprises a synergetic combination of a methacrylic acid-containing polymer with a strongly interacting nonionic surfactant, together with a chelant and/or a phosphate-generating species. The method is particularly effective when the surfactant is an alkoxylated alkylphenol or an alkoxylated alkylphenol ether.
    Type: Grant
    Filed: March 15, 1988
    Date of Patent: May 9, 1989
    Assignee: Betz Laboratories, Inc.
    Inventors: Alexander C. McDonald, James L. Soos