Patents by Inventor Ruth A. Dudenhoefer

Ruth A. Dudenhoefer 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).

  • Inorganic poundry binder systems and their uses
    Patent number: 5390727
    Abstract: This invention relates to inorganic no-bake foundry binder systems and their uses. The binder systems comprise as separate Part A and Part B components: (A) an aqueous solution of specified phosphoric acids, and (B) a mixture comprising (1) an iron oxide selected from the group consisting of (a) ferrous oxide, (b) ferroferric oxide, and (c) mixtures thereof and (2) magnesium oxide. The binder systems are used to prepare foundry mixes which are used to prepare foundry molds and cores. The foundry molds and cores are used to cast metals.
    Type: Grant
    Filed: January 7, 1994
    Date of Patent: February 21, 1995
    Assignee: Ashland Oil, Inc.
    Inventors: Yuily M. Yunovich, Ruth A. Dudenhoefer, Heimo J. Langer
  • Inorganic foundry binder systems and their uses
    Patent number: 5279665
    Abstract: This invention relates to inorganic no-bake foundry binder systems and their uses. The binder systems comprise as separate Part A and Part B components: (A) an aqueous solution of specified phosphoric acids, and (b) a mixture comprising (1) an iron oxide selected from the group consisting of (a) ferrous oxide, (b) ferroferric oxide, and (c) mixtures thereof and (2) magnesium oxide. The binder systems are used to prepare foundry mixes which are used to prepare foundry molds and cores. The foundry molds and cores are used to cast metals.
    Type: Grant
    Filed: October 30, 1991
    Date of Patent: January 18, 1994
    Assignee: Ashland Oil, Inc.
    Inventors: Yuily M. Yunovich, Ruth A. Dudenhoefer, Heimo J. Langer