Patents by Inventor Walter F. Yext

Walter F. Yext 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 the manufacture of copper thick-film conductors using an infrared furnace
    Patent number: 4965092
    Abstract: Water added to the furnace heated by an infrared or near-infrared radiation source used to fire thick-film electrical components provides finished components exhibiting desirable physical and electrical properties and surface cleanliness.
    Type: Grant
    Filed: April 28, 1989
    Date of Patent: October 23, 1990
    Inventors: Edward A. Hayduk, Jr., Walter F. Yext, David R. Taschler
  • Process for manufacturing thick-film electrical components
    Patent number: 4622240
    Abstract: Nitrous oxide additions to the furnace atmosphere during firing of thick film electrical components minimizes soot deposition from vaporization of vehicle contained in the film paste.
    Type: Grant
    Filed: November 12, 1985
    Date of Patent: November 11, 1986
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Walter F. Yext, Edward A. Hayduk, Clark K. Fisher
  • Production of 1-hydroxyalkylidene-1, 1-diphosphonic acid esters
    Patent number: 4332736
    Abstract: Acylated 1-hydroxyalkylidene-1, 1-diphosphonic acid (HADPA) can be produced almost instantaneously with less than 5% (by weight) phosphorus acid byproduct by introducing PX.sub.3 (where X is a halide) into a reactor containing R--COOH at or above a specified temperature. The acylated HADPA can then be hydrolyzed and substantially pure HADPA obtained by vacuum distillation. Of particular importance is the addition of PCl.sub.3 to acetic acid at a temperature of between 105.degree. C. and 120.degree. C. to produce acetylated 1-hydroxyethylidene-1, 1-diphosphonic acid (HEDPA).
    Type: Grant
    Filed: September 22, 1980
    Date of Patent: June 1, 1982
    Assignee: Air Products and Chemicals, Inc.
    Inventors: William E. Starner, Walter F. Yext