Patents by Inventor David S. Poa

David S. Poa 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: 4995948
    Abstract: An apparatus and process for reducing uranium and/or plutonium oxides to produce a solid, high-purity metal. The apparatus is an electrolyte cell consisting of a first container, and a smaller second container within the first container. An electrolyte fills both containers, the level of the electrolyte in the first container being above the top of the second container so that the electrolyte can be circulated between the containers. The anode is positioned in the first container while the cathode is located in the second container. Means are provided for passing an inert gas into the electrolyte near the lower end of the anode to sparge the electrolyte and to remove gases which form on the anode during the reduction operation. Means are also provided for mixing and stirring the electrolyte in the first container to solubilize the metal oxide in the electrolyte and to transport the electrolyte containing dissolved oxide into contact with the cathode in the second container.
    Type: Grant
    Filed: July 24, 1989
    Date of Patent: February 26, 1991
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: David S. Poa, Leslie Burris, Robert K. Steunenberg, Zygmunt Tomczuk
  • Patent number: 4544616
    Abstract: A battery containing a zinc electrode with a porous separator between the anode and cathode. The separator is a microporous substrate carrying therewith an organic solvent of benzene, toluene or xylene with a tertiary organic amine therein, wherein the tertiary amine has three carbon chains each containing from six to eight carbon atoms. The separator reduces the rate of zinc dentrite growth in the separator during battery operation prolonging battery life by preventing short circuits. A method of making the separator is also disclosed.
    Type: Grant
    Filed: February 16, 1984
    Date of Patent: October 1, 1985
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: David S. Poa, Neng-Ping Yao