Patents by Inventor Libardo A. Perez

Libardo A. Perez 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).

  • Compositions for controlling scale formation in aqueous system
    Patent number: 5342540
    Abstract: The treatment of an aqueous system to inhibit scale formation with a polyepoxysuccinic acid scale inhibitor, an acrylic acid copolymer and a lanthanide ion blending agent.
    Type: Grant
    Filed: March 29, 1993
    Date of Patent: August 30, 1994
    Assignee: Betz Laboratories, Inc.
    Inventor: Libardo A. Perez
  • Method for inhibiting silica and silicate deposition
    Patent number: 5332505
    Abstract: A method and composition for inhibiting silica and silicate deposition on metal surfaces in contact with aqueous systems is disclosed.
    Type: Grant
    Filed: October 2, 1992
    Date of Patent: July 26, 1994
    Assignee: Betz Laboratories, Inc.
    Inventors: William S. Carey, Andrew Solov, Libardo A. Perez
  • Methods for controlling scale formation in aqueous systems
    Patent number: 5326478
    Abstract: A method of controlling the formation and deposition of scale forming salts in a circulating aqueous system is described wherein a treatment solution of a substoichiometric amount of polyepoxysuccinic acid in combination with agaric acid is employed.
    Type: Grant
    Filed: July 29, 1993
    Date of Patent: July 5, 1994
    Assignee: Betz Laboratories, Inc.
    Inventors: Libardo A. Perez, Donald T. Freese, Judith B. Rockett, William S. Carey
  • Method for controlling silica and water soluble silicate deposition
    Patent number: 5256302
    Abstract: A method for the inhibition of silica and silicate deposits on the internal surfaces of a water system consisting of adding to the water system a composition comprised of a blend of two water soluble copolymers. The first copolymer contains repeat units of maleic or acrylic acids and a phosphinic acid, or salt forms thereof. The second copolymer contains repeat units of acrylic acid and allyl hydroxy propyl sulfonate ether, or salt forms thereof.
    Type: Grant
    Filed: May 18, 1992
    Date of Patent: October 26, 1993
    Assignee: Betz Laboratories, Inc.
    Inventors: Libardo A. Perez, J. Michael Brown, Khac T. Nguyen
  • Methods of controlling scale formation in aqueous systems
    Patent number: 5248438
    Abstract: The treatment of an aqueous system to inhibit scale formation with a polyepoxysuccinic acid scale inhibitor, an acrylic acid copolymer and a lanthanide ion blending agent.
    Type: Grant
    Filed: January 28, 1992
    Date of Patent: September 28, 1993
    Assignee: Betz Laboratories, Inc.
    Inventor: Libardo A. Perez