Patents by Inventor Joseph W. Wittmann

Joseph W. Wittmann 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).

  • Tinted contact lens and method for preparation with dichlorotriazine reactive dye
    Patent number: 4891046
    Abstract: Hydrophilic contact lenses comprised of a copolymer of an hydroxyl group-containing monomer and N-vinylpyrrolidone are tinted by impregnating the lens with an aqueous solution of a dichlorotriazine reactive dye and fixing the dye in the lens by contacting the lens with an aqueous alkaline solution.
    Type: Grant
    Filed: March 15, 1984
    Date of Patent: January 2, 1990
    Assignee: CooperVision, Inc.
    Inventors: Joseph W. Wittmann, John M. Evans
  • Oxygen permeable hard contact lens
    Patent number: 4508884
    Abstract: Oxygen permeable hard contact lenses from the copolymerization of ethylenically unsaturated silicone ester; sterically hindered or bulky aliphatic ester of ethylenically unsaturated carboxylic acid, and hydrophilic monomer; and method for the polymerization thereof.
    Type: Grant
    Filed: May 25, 1983
    Date of Patent: April 2, 1985
    Assignee: CooperVision, Inc.
    Inventors: Joseph W. Wittmann, John M. Evans
  • Cured cellulose ester, method of curing same, and use thereof
    Patent number: 4454295
    Abstract: Cellulose esters are cured by exposure to radiation preferably followed by exposure to elevated temperatures of at least about 100.degree. C. In addition, polymers obtained from reacting certain cellulose esters with certain polymerizable silicon esters are provided. The cured cellulose esters are suitable for producing transparent parts such as contact lenses.
    Type: Grant
    Filed: July 25, 1983
    Date of Patent: June 12, 1984
    Assignee: UCO Optics, Inc.
    Inventors: Joseph W. Wittmann, John M. Evans
  • Cured cellulose ester, method of curing same, and use thereof
    Patent number: 4395496
    Abstract: Cellulose esters are cured by exposure to radiation preferably followed by exposure to elevated temperatures of at least about 100.degree. C. In addition, polymers obtained from reacting certain cellulose esters with certain polymerizable silicon esters are provided. The cured cellulose esters are suitable for producing transparent parts such as contact lenses.
    Type: Grant
    Filed: November 16, 1981
    Date of Patent: July 26, 1983
    Assignee: UCO Optics, Inc.
    Inventors: Joseph W. Wittmann, John M. Evans