Patents by Inventor David H. Clemens

David H. Clemens 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).

  • Method of purifying condensate waters for steam regenerating equipment
    Patent number: 4886606
    Abstract: Strong base ion exchange resins derived from crosslinked vinylbvenzyl chloride polymers are particularly suitable for purifying condensate waters for steam regenerating equipment. Preferred embodiments utilize gellular anion exchange resins to remove corrosion products from boiler condensate waters.
    Type: Grant
    Filed: June 13, 1988
    Date of Patent: December 12, 1989
    Assignee: Rohm and Haas Company
    Inventors: David H. Clemens, Marvin J. Hurwitz, Robert W. Walker
  • Preparation, polymerization, and use of new bis-vinylbenzyl nitrogenous monomers
    Patent number: 4248797
    Abstract: This invention relates to vinylbenzyl and crosslinking bis-(vinylbenzyl) monomers for use in the preparation of polymers, especially ion exchange resins, and to methods for the preparation of the monomers and polymers. It is particularly concerned with the preparation, polymerization, and use of new nitrogenous monomers as crosslinking agents and/or function-introducing agents.
    Type: Grant
    Filed: September 18, 1978
    Date of Patent: February 3, 1981
    Assignee: Rohm and Haas Company
    Inventors: Frank J. Glavis, David H. Clemens
  • Hybrid copolymers
    Patent number: 4152496
    Abstract: Hybrid copolymers are prepared by at least partially filling the macropores of a macroreticular copolymer with a guest crosslinked copolymer of either the same monomers or a copolymer of different type monomers. The hybrid copolymers can be readily converted into ion exchange resins. Such resins have markedly improved physical and chemical properties, including improved ion exchange properties.
    Type: Grant
    Filed: September 18, 1978
    Date of Patent: May 1, 1979
    Assignee: Rohm and Haas Company
    Inventors: James H. Barrett, David H. Clemens
  • Preparation, polymerization and use of new bis-vinylbenzyl nitrogenous monomers
    Patent number: 4140659
    Abstract: This invention relates to nitrogenous vinylbenzyl and bis-(vinylbenzyl) compounds for use in the preparation of polymers, especially ion exchange resins, and to processes for the preparation of the monomers and polymers. More particularly, it relates to the preparation, polymerization, and use of the new nitrogenous compounds as crosslinking agents and/or function-introducing agents.
    Type: Grant
    Filed: October 13, 1977
    Date of Patent: February 20, 1979
    Assignee: Rohm and Haas Company
    Inventors: David H. Clemens, Frank J. Glavis, deceased
  • Preparation, polymerization, and use of new bis-vinylbenzyl nitrogenous monomers
    Patent number: 4137264
    Abstract: This invention relates to vinylbenzyl and crosslinking bis-(vinylbenzyl) monomers for use in the preparation of polymers, especially ion exchange resins, and to methods for the preparation of the monomers and polymers. It is particularly concerned with the preparation, polymerization, and use of new nitrogenous monomers as crosslinking agents and/or function-introducing agents.
    Type: Grant
    Filed: March 21, 1977
    Date of Patent: January 30, 1979
    Assignee: Rohm and Haas Company
    Inventors: Frank L. Glavis, David H. Clemens
  • Desalination process using thermally regenerable resins
    Patent number: 4087357
    Abstract: A process for desalinating water containing mineral salts utilizes thermally regenerable hybrid resins. A preferred embodiment provides for the desalination of saline water using hybrid resins comprising per hundred parts of macroreticular host polymer, a guest phase ranging from 50 to 300 parts by weight.
    Type: Grant
    Filed: October 9, 1974
    Date of Patent: May 2, 1978
    Assignee: Rohm and Haas Company
    Inventors: James H. Barrett, David H. Clemens
  • Ion exchange resins derived from hybrid copolymers
    Patent number: 3991017
    Abstract: Hybrid copolymers are prepared by at least partially filling the macropores of a macroreticular ion exchange resin with a gel type, crosslinked copolymer of either the same monomers or a copolymer of different type monomers. The hybrid copolymers can be readily converted into ion exchange resins. Such resins have markedly improved physical and chemical properties, including improved ion exchange properties.
    Type: Grant
    Filed: October 15, 1974
    Date of Patent: November 9, 1976
    Assignee: Rohm and Haas Company
    Inventors: James H. Barrett, David H. Clemens
  • Method of preparing resins containing sulfonic acid functionality involving oxidation of thiouronium salts with hydrogen peroxide
    Patent number: 3944507
    Abstract: Resins containing sulfonic acid functionality may be prepared by reacting a chloromethylated polymer matrix with thiourea and then oxidizing the resulting isothiouronium salt to the sulfonic acid in the presence of hydrogen peroxide, either directly or with the intermediate isolation of the thiol.
    Type: Grant
    Filed: January 15, 1975
    Date of Patent: March 16, 1976
    Assignee: Rohm and Haas Company
    Inventors: David H. Clemens, Raymond J. Lange