Patents by Inventor Norman A. Leister

Norman A. Leister 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 the preparation of salt free, water free 3-isothiazolone compounds
    Patent number: 5068344
    Abstract: A process for preparing a 3-isothiazolone of the formula ##STR1## wherein Y is selected from the group consisting of alkyl or substituted alkyl of 1 to 10 carbon atoms; unsubstituted or halogen-substituted alkenyl or alkynyl of 2 to 10 carbon atoms; and aralkyl or halogen-, lower alkyl-, or lower alkoxy-substituted aralkyl of up to 10 carbon atoms;X is hydrogen or a (C.sub.1 -C.sub.2) alkyl; andX.sup.1 is hydrogen, chlorine, or a (C.sub.1 -C.sub.2) alkyl; comprising(a) reacting anhydrous ammonia with an isothiazolone salt of the formula ##STR2## wherein Z is chlorine, bromine, sulfate or fluorosulfonate;m is 1 when Z is chlorine, bromine or fluorosulfonate, and m is 2 when Z is sulfate; and(b) separating the resultant (NH.sub.4).sub.m Z from the resultant free base isothiazolone is disclosed.
    Type: Grant
    Filed: January 12, 1990
    Date of Patent: November 26, 1991
    Assignee: Rohm and Haas Company
    Inventors: Ramesh B. Petigara, Norman A. Leister, Barry J. Pendell, Robert A. Woodruff
  • Alkaline earth metal salt dispersions in acrylic polymers
    Patent number: 4123368
    Abstract: This invention relates to colloidal dispersions of an alkaline earth metal salt in an oil-soluble acrylic polymer which is polymerized from a monomer system of at least one alkyl or hetero-substituted alkyl ester of an acrylic monomer selected from the group consisting of methacrylates and acrylates represented by the formula: ##STR1## wherein R.sup.1 is a --CH.sub.3 or --H radical, and R.sup.2 is selected from the group consisting of C.sub.1-30 alkyl and hetero-substituted alkyl radicals. This invention also relates to colloidal dispersions as described hereinabove wherein the monomer system further includes at least one non-acrylic polymerizable ethylenically unsaturated nitrogen-containing compound. Preferred polymerizable ethylenically unsaturated nitrogen-containing compounds are those selected from the group consisting of 2- and 4-vinylpyridines and N-vinyl-2-pyrrolidinones.
    Type: Grant
    Filed: March 24, 1977
    Date of Patent: October 31, 1978
    Assignee: Rohm and Haas Company
    Inventors: Norman A. Leister, Andrew Neuman
  • Processes of preparing oligomers
    Patent number: 4009195
    Abstract: This invention relates to novel oligomers of 1-alkenes and derivatives of acrylic acids, to methods of making the oligomers, and to compositions which comprise the oligomers.
    Type: Grant
    Filed: June 12, 1975
    Date of Patent: February 22, 1977
    Assignee: Rohm and Haas Company
    Inventors: Norman A. Leister, Richard J. Piccolini
  • Post reacted oligomers
    Patent number: 3994958
    Abstract: This invention relates to novel oligomers of 1-alkenes and derivatives of acrylic acids, to methods of making the oligomers, and to compositions which comprise the oligomers.
    Type: Grant
    Filed: June 12, 1975
    Date of Patent: November 30, 1976
    Assignee: Rohm and Haas Company
    Inventors: Norman A. Leister, Richard J. Piccolini
  • Copolymers of 1-alkenes and acrylic acid derivatives
    Patent number: 3968148
    Abstract: This invention relates to novel oligomers of 1-alkenes and derivatives of acrylic acids, to methods of making the oligomers, and to compositions which comprise the oligomers.
    Type: Grant
    Filed: September 13, 1971
    Date of Patent: July 6, 1976
    Assignee: Rohm and Haas Company
    Inventors: Norman A. Leister, Richard J. Piccolini