Patents by Inventor Leonard S. Aubrey

Leonard S. Aubrey 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).

  • Dual stage ceramic foam filtration system and method
    Patent number: 5673902
    Abstract: There is provided a dual stage ceramic foam molten metal filtration system and method. Coarse and fine filters are mounted adjacent to one another in a molten metal flow path. A convection preheat apparatus provides preheat for both filters. A vent structure is included to vent air which may be trapped in a gap which is formed between the two filters.
    Type: Grant
    Filed: February 1, 1996
    Date of Patent: October 7, 1997
    Assignee: Selee Corporation
    Inventors: Leonard S. Aubrey, Clifton L. Oliver, Bruce T. MacPhail
  • Method for producing wax impregnated filters for investment casting applications
    Patent number: 4978452
    Abstract: The present invention relates to wax impregnated filters for use in investment casting applications and a method for forming them. The filters are characterized by a wax impregnated ceramic substrate, wax layers bonded to two opposed surfaces of the substrate, and peripheral edges having exposed ceramic surfaces which can be adhered to the ceramic liner of an investment casting apparatus. The method comprises providing a sheet of ceramic foam filter material, impregnating the sheet with sufficient liquid wax to form a wax layer of desired thickness bonded to each of two opposed surfaces of the sheet, allowing the wax to solidify, and precision cutting the impregnated sheet into filters having a desired set of dimensions. The method further comprises exposing the peripheral edges of each filter to allow the ceramic shell building or liner in the investment casting apparatus to bond directly to the filter.
    Type: Grant
    Filed: May 15, 1989
    Date of Patent: December 18, 1990
    Assignee: Alusuisse-Lonza Services Ltd.
    Inventor: Leonard S. Aubrey
  • Ceramic foam filter
    Patent number: 4975191
    Abstract: An improved ceramic foam filter for use in filtering molten metal prepared from a ceramic slurry containing silicon carbide and a colloidal silica binder. The filter has a solids content of at least 50% silicon carbide and at least 3% of silica.
    Type: Grant
    Filed: June 26, 1989
    Date of Patent: December 4, 1990
    Assignee: Swiss Aluminium Ltd.
    Inventors: Jerry W. Brockmeyer, Leonard S. Aubrey, James E. Dore
  • Ceramic foam filter and process for preparing same
    Patent number: 4885263
    Abstract: An improved ceramic foam filter for use in filtering molten metal prepared from a ceramic slurry containing silicon carbide and a colloidal silica binder. The filter has a solids content of at least 50% silicon carbide and at least 3% of silica.
    Type: Grant
    Filed: March 23, 1987
    Date of Patent: December 5, 1989
    Assignee: Swiss Aluminium Ltd.
    Inventors: Jerry W. Brockmeyer, Leonard S. Aubrey, James E. Dore
  • Vented pouring cup for molten metal casting
    Patent number: 4708326
    Abstract: A molten metal pouring cup is provided communicating with a transfer means for transferring molten metal from the pouring cup to a casting station. Vent means is provided on the pouring cup at the interface between the pouring cup and the transfer means to permit release of entrapped gas downstream of the pouring cup.
    Type: Grant
    Filed: December 15, 1986
    Date of Patent: November 24, 1987
    Assignee: Swiss Aluminium Ltd.
    Inventors: Jerry W. Brockmeyer, Leonard S. Aubrey, James E. Dore, Clifford N. Soble