Patents by Inventor Norman Alfred Smith

Norman Alfred Smith 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).

  • Sulfur containing vinyl amide cross-linking agents
    Patent number: 4120898
    Abstract: New vinyl compounds of the general formula ##STR1## are provided, wherein A is --CO-- or --SO.sub.2 --, v is 0 or 1, w is 0 or an integer of 1 to 6, x is 0 or 1, y is 2 to 6 and z is 1 or 2, at least one of w and x x being a positive integer. The vinyl compounds are useful as cross-linking agents for hydrophylic colloids, especially for gelatine in gelatino silver halide emulsion layers and other layers in photographic material.
    Type: Grant
    Filed: January 18, 1977
    Date of Patent: October 17, 1978
    Assignee: Ciba-Geigy AG
    Inventors: Norman Alfred Smith, Rainer Kitzing
  • Vinylsulphone hardeners
    Patent number: 4104302
    Abstract: Vinylsulphone compounds of the general formula[CH.sub.2 =CHSO.sub.2 CH.sub.2 CH.sub.2 (CONH).sub.x (CH.sub.2).sub.3 ].sub.2 --O(CH.sub.2 CH.sub.2 O).sub.y --,wherein x is 1 or 2 and y is 0 or an integer of 1 to 100 are provided. These compounds are useful as cross-linking agents for hydrophilic colloids, especially for gelatin which is in the form of layers of photographic materials.
    Type: Grant
    Filed: October 22, 1976
    Date of Patent: August 1, 1978
    Assignee: Ciba-Geigy AG
    Inventors: Norman Alfred Smith, Rainer Kitzing
  • Bis 1,4-(b-vinylso.sub.2 -propionyl)-piperazine
    Patent number: 4088648
    Abstract: A vinylsulphone compound of the formula ##STR1## is provided. This compound is useful as cross-linking agent for hydrophilic colloids, especially for gelatin which is in the form of layers of photographic materials.
    Type: Grant
    Filed: October 22, 1976
    Date of Patent: May 9, 1978
    Assignee: Ciba-Geigy AG
    Inventor: Norman Alfred Smith
  • Process for crosslinking hydrophilic colloids with triazine compounds
    Patent number: 4076538
    Abstract: The present invention relates to a process for crosslinking hydrophilic materials by means of a triazine compound of the formula ##STR1## The process is preferably used for crosslinking gelatin in photographic material.
    Type: Grant
    Filed: November 13, 1975
    Date of Patent: February 28, 1978
    Assignee: Ciba-Geigy AG
    Inventor: Norman Alfred Smith
  • Process for crosslinking hydrophilic colloids
    Patent number: 4043995
    Abstract: The present invention relates to a process for crosslinking hydrophilic colloids, preferably gelatine and most preferably gelatine present in a photographic material. A 1,3,5-triazine compound containing an NC--N.sup.- -- substituent bound to the triazine ring is incorporated into the hydrophilic colloid as a crosslinking agent.
    Type: Grant
    Filed: May 19, 1975
    Date of Patent: August 23, 1977
    Assignee: Ciba-Geigy AG
    Inventors: Rainer Kitzing, Norman Alfred Smith
  • Production of hardened gelatin layers by the addition of quaternary carbamoyl pyridinium compounds
    Patent number: 4014862
    Abstract: The present invention relates to the production of hardened gelatin layers by means of quaternary carbamoyl pyridinium compounds. Preferably this method is used for the hardening of silver halide photographic material.
    Type: Grant
    Filed: July 6, 1973
    Date of Patent: March 29, 1977
    Assignee: Ilford Limited
    Inventors: John Douglas Ballantine, Norman Alfred Smith
  • Method of producing a hardened gelatin layer using aqueous solution of a 2-halogeno pyridinium compound
    Patent number: 3951940
    Abstract: This invention relates to the hardening of gelatin layers. The gelatin is heated with an aqueous solution of a 2-halogeno pyridinium compound.
    Type: Grant
    Filed: September 30, 1974
    Date of Patent: April 20, 1976
    Assignee: Ciba-Geigy AG
    Inventors: John Douglas Ballantine, Norman Alfred Smith