Patents by Inventor Joseph E. Ritsko

Joseph E. Ritsko 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 producing ammonium metatungstate from ammonium tungstate by digestion in silica
    Patent number: 3956474
    Abstract: A process for producing ammonium metatungstate (AMT) from ammonium tungstate (AT) solution is described which involves the addition of about 3.6 percent by weight of silica to an AT solution, digestion for at least about 4 hours at a temperature of at least about 98.degree.C, followed by filtration to remove the silica from the AMT solution. Typically about 0.4 percent by weight of silica remains after filtering. The resulting AMT solution may be further processed to recover solid AMT, such as by evaporation or spray drying.
    Type: Grant
    Filed: January 27, 1975
    Date of Patent: May 11, 1976
    Assignee: GTE Sylvania Incorporated
    Inventor: Joseph E. Ritsko
  • Process for producing cobalt coated refractory metal carbides
    Patent number: 3947616
    Abstract: Cemented refractory metal carbides are coated with cobalt to a predetermined thickness by immersing a cemented refractory metal carbide in an aqueous slurry consisting essentially of a cobalt source, a hydrazine compound and a buffering agent to provide a pH greater than 7 and maintaining the temperature of the slurry at from about 65.degree. to 90.degree.C for a sufficient time to achieve the desired thickness of cobalt coating on the external surfaces of the cemented refractory metal carbide.
    Type: Grant
    Filed: September 27, 1973
    Date of Patent: March 30, 1976
    Assignee: GTE Sylvania Incorporated
    Inventors: Joseph E. Ritsko, Donald S. Parsons