Patents by Inventor George M. Lein, Jr.

George M. Lein, Jr. 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).

  • Preparation of isothiazolones
    Patent number: 4994574
    Abstract: Preparation of 3-isothiazolones by a single-kettle synthesis from a 3,3'-dithiodipropionic acid, a 3-thiopropionic acid, or their related acid halide by reacting sequentially with a thionyl halide (if the (di)acid halide has not previously been formed), followed by reaction with a halogenating agent, then a primary amine and base, and then with a halogenating agent.
    Type: Grant
    Filed: November 27, 1987
    Date of Patent: February 19, 1991
    Inventor: George M. Lein, Jr.
  • 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
  • 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.