Patents by Inventor Yao-Sin Su

Yao-Sin Su 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 treatment of zirconia ceramic
    Patent number: 4135012
    Abstract: Smooth surfaces of impervious zirconia-base ceramics are chemically treated to produce micropitting and/or microcratering therein which enables durable adherence of metal coatings (e.g. of noble metal) applied thereon. Treatment involves contact of the smooth surfaces with liquid leachant selected from concentrated sulfuric acid, ammonium bisulfate, alkali metal bisulfate and mixtures thereof at a temperature of at least 250.degree. C. Leached surface is contacted with hydrochloric acid to remove reaction residue comprising sulfate of metal elements including zirconium in the ceramic.
    Type: Grant
    Filed: April 25, 1977
    Date of Patent: January 16, 1979
    Assignee: Corning Glass Works
    Inventor: Yao-Sin Su
  • Purification of hydrofluoric acid etching solutions with weak anion exchange resins
    Patent number: 4125594
    Abstract: A method for purifying a spent hydrofluoric acid etching solution containing siliceous by-products which comprises treating the solution with a weak anion exchange resin of the polyamine type to remove SiF.sub.6.sup.= ions therefrom is described. The anion exchange resin may be regenerated with aqueous NaOH.
    Type: Grant
    Filed: December 22, 1976
    Date of Patent: November 14, 1978
    Assignee: Corning Glass Works
    Inventors: Yao-Sin Su, Ken F. Sugawara