Patents by Inventor Ann M. McCombs

Ann M. McCombs 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).

  • Patent number: 5256608
    Abstract: A powdered admixture of a boron, carbon, nitrogen or silicon derivative of a first metal is combined with a source of a second metal and, optionally, a source of a third metal or an iron-group metal, subjected to densification conditions (heat and pressure), partially reacted and converted to a hard, wear resistant material. The wear resistant material contains an amount of the first metal derivative as well as a material of varying stoichiometry which is the partial reaction product of components of the powdered admixture. The material may also contain residual, unreacted portions of components other than the first metal derivative. Articles formed from this material can be useful as, for example, nozzles in abrasive or nonabrasive waterjet cutting machines and various parts of wire drawing apparatus.
    Type: Grant
    Filed: December 13, 1991
    Date of Patent: October 26, 1993
    Assignee: The Dow Chemical Company
    Inventors: Ellen M. Dubensky, Edward E. Timm, Ann M. McCombs, Julie L. Board
  • Patent number: 5223460
    Abstract: A powdered admixture of a boron, carbon, nitrogen or silicon derivative of a first metal is combined with a source of a second metal and, optionally, a source of a third metal or an iron-group metal, subjected to densification conditions (heat and pressure), partially reacted and converted to a hard, wear resistant material. The wear resistant material contains an amount of the first metal derivative as well as a material of varying stoichiometry which is the partial reaction product of components of the powdered admixture. The material may also contain residual, unreacted portions of components other than the first metal derivative. Articles formed from this material can be useful as, for example, nozzles in abrasive or nonabrasive waterjet cutting machines and various parts of wire drawing apparatus.
    Type: Grant
    Filed: December 13, 1991
    Date of Patent: June 29, 1993
    Assignee: The Dow Chemical Company
    Inventors: Ellen M. Dubensky, Edward E. Timm, Ann M. McCombs, Julie L. Board
  • Patent number: 5215945
    Abstract: A powdered admixture of a boron, carbon, nitrogen or silicon derivative of a first metal is combined with a source of a second metal and, optionally, a source of a third metal or an iron-group metal, subjected to densification conditions (heat and pressure), partially reacted and converted to a hard, wear resistant material. The wear resistant material contains an amount of the first metal derivative as well as a material of varying stoichiometry which is the partial reaction product of components of the powdered admixture The material may also contain residual, unreacted portions of components other than the first metal derivative. Articles formed from this material can be useful as, for example, nozzles in abrasive or nonabrasive waterjet cutting machines and various parts of wire drawing apparatus.
    Type: Grant
    Filed: December 13, 1991
    Date of Patent: June 1, 1993
    Assignee: The Dow Chemical Company
    Inventors: Ellen M. Dubensky, Edward E. Timm, Ann M. McCombs, Julie L. Board
  • Patent number: 5089447
    Abstract: A powdered admixture of a metal and its boron, carbon, nitrogen or silicon derivative is, when subjected to densification conditions, partially reacted and converted to a hard, wear resistant material. Such a material, when formed from an admixture of tungsten carbide and tungsten, contains tungsten monocarbide and (di-tungsten) carbide. Other choices of metal and metal derivatives produce at least one compound having a stoichiometry which differs from that of starting metal derivative. Articles formed from this material can be useful as, for example, nozzles in abrasive or nonabrasive waterjet cutting machines and various parts of wire drawing apparatus.
    Type: Grant
    Filed: October 9, 1990
    Date of Patent: February 18, 1992
    Assignee: The Dow Chemical Company
    Inventors: Edward E. Timm, Ann M. McCombs