Patents by Inventor Thomas J. Howell

Thomas J. Howell 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).

  • Process for producing an expanded seed copolymer and product therefrom
    Patent number: 4582859
    Abstract: An improved process for the manufacture of crosslinked copolymer particles from seed particles by imbibing a monomer therein and polymerizing the same under controlled suspension conditions wherein said improvement comprises expanding the seed in staged or sequential steps of feeding lower levels of crosslinking monomers in the early stages and preferably higher levels of crosslinking monomers at later stages of polymerization.
    Type: Grant
    Filed: December 2, 1983
    Date of Patent: April 15, 1986
    Assignee: Rohm and Haas Company
    Inventors: George M. Lein, Jr., Thomas J. Howell, James H. Barrett
  • Ion exchange resins
    Patent number: 4431785
    Abstract: Hard, infusible, discrete beads of crosslinked copolymer are prepared by free-radical catalyzed polymerization of a monomer mixture in aqueous dispersion wherein a minor amount of a modifier, specifically an organic compound containing acetylenic or allylic unsaturation having the ability to moderate the rate of polymerization, is incorporated in the monomer mixture. Ion exchange resins having improved mechanical strength are obtained by attaching functional groups to the copolymer.
    Type: Grant
    Filed: January 16, 1981
    Date of Patent: February 14, 1984
    Assignee: Rohm and Haas Company
    Inventors: Thomas J. Howell, William G. Paterson, Ian Pattison
  • Copolymer process and product therefrom consisting of crosslinked seed bead swollen by styrene monomer
    Patent number: 4419245
    Abstract: A process for the manufacture of crosslinked ion exchange copolymer particles wherein small seed particles are swollen to final size by concurrently feeding monomer and polymerizing the same under controlled suspension conditions and the unique ion exchange particles produced thereby.
    Type: Grant
    Filed: June 30, 1982
    Date of Patent: December 6, 1983
    Assignee: Rohm and Haas Company
    Inventors: James H. Barrett, Thomas J. Howell, George M. Lein, Jr.
  • Ion exchange resins
    Patent number: 4375519
    Abstract: Hard, infusible, discrete beads of crosslinked copolymer are prepared by free-radical catalyzed polymerization of a monomer mixture in aqueous dispersion wherein a minor amount of a modifier, specifically an organic compound containing acetylenic or allylic unsaturation having the ability to moderate the rate of polymerization, is incorporated in the monomer mixture. Ion exchange resins having improved mechanical strength are obtained by attaching functional groups to the copolymer.
    Type: Grant
    Filed: September 22, 1980
    Date of Patent: March 1, 1983
    Assignee: Rohm and Haas Company
    Inventors: Thomas J. Howell, William G. Paterson, Ian Pattison
  • Resins
    Patent number: 4283499
    Abstract: Ion exchange resins having improved physical stability and perfect bead count are prepared by a free-radical catalyzed polymerization of a monomer mixture utilizing certain peroxyester and peroxydicarbonate catalysts, followed by functionalizing the so prepared polymer.
    Type: Grant
    Filed: March 17, 1980
    Date of Patent: August 11, 1981
    Assignee: Rohm and Haas Company
    Inventor: Thomas J. Howell
  • Ion exchange resins
    Patent number: 4246386
    Abstract: Hard, infusible, discrete beads of crosslinked copolymer are prepared by free-radical catalyzed polymerization of a monomer mixture in aqueous dispersion wherein a minor amount of a modifier, specifically an organic compound containing acetylenic or allylic unsaturation having the ability to moderate the rate of polymerization, is incorporated in the monomer mixture. Ion exchange resins having improved mechanical strength are obtained by attaching functional groups to the copolymer.
    Type: Grant
    Filed: May 8, 1978
    Date of Patent: January 20, 1981
    Assignee: Rohm and Haas Company
    Inventors: Thomas J. Howell, William G. Paterson, Ian Pattison