Patents by Inventor Joseph P. Tiefenbach

Joseph P. Tiefenbach 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).

  • Surface-treated soft contact lenses
    Patent number: 4128318
    Abstract: Polymer hydrogels adapted for use as soft contact lenses are treated to provide at least on the surfaces thereof a modified, less hydrophilic polymeric structure inhibiting penetration by bacteria and proteins, whereby development of clouding and discoloration of the lens material is significantly retarded in use.
    Type: Grant
    Filed: March 22, 1978
    Date of Patent: December 5, 1978
    Assignee: Diamond Shamrock Corporation
    Inventors: Charles L. Sieglaff, Charles J. Hora, Joseph P. Tiefenbach
  • Surface-treated soft contact lenses
    Patent number: 4097657
    Abstract: Polymer hydrogels adapted for use as soft contact lenses are treated to provide at least on the surfaces thereof a modified, less hydrophilic polymeric structure inhibiting penetration by bacteria and proteins, whereby development of clouding and discoloration of the lens material is significantly retarded.
    Type: Grant
    Filed: April 7, 1976
    Date of Patent: June 27, 1978
    Assignee: Diamond Shamrock Corporation
    Inventors: Charles L. Sieglaff, Charles J. Hora, Joseph P. Tiefenbach