Patents by Inventor Claire E. Closmann

Claire E. Closmann 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).

  • Solution method for making molybdate and tungstate negative thermal expansion materials and compounds made by the method
    Patent number: 6183716
    Abstract: A method for making negative thermal expansion materials having the formula A 4 + ⁢ M 2 6 + ⁢ O 8 where A4+ is Zr4+, Hf4+, or mixtures thereof, and M6+ is Mo6+, W6+, or mixtures thereof, is described. The method comprises first forming an acidic, liquid mixture comprising stoichiometric amounts of (1) a soluble source of Zr4+, Hf4+, or mixtures thereof, and (2) a sodium-ion-free tungstate salt, a sodium-ion-free molybdate salt, or mixtures thereof. This liquid mixture is then heated, either at reflux temperature or in a closed system at pressures greater than ambient, to produce a solid fraction.
    Type: Grant
    Filed: July 30, 1998
    Date of Patent: February 6, 2001
    Assignee: State of Oregon acting by and through the State Board of Higher Education of behalf of Oregon State University
    Inventors: Arthur W. Sleight, Claire E. Closmann, John C. Haygarth, Kameswari Upadhyayula