Patents by Inventor Paul V. Kelsey, Jr.

Paul V. Kelsey, Jr. 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: 4398980
    Abstract: A method of fabricating a seal between a ceramic and an alloy comprising the steps of prefiring the alloy in an atmosphere with a very low partial pressure of oxygen, firing the assembled alloy and ceramic in air, and gradually cooling the fired assembly to avoid the formation of thermal stress in the ceramic. The method forms a bond between the alloy and the ceramic capable of withstanding the environment of a pressurized water reactor and suitable for use in an electrical conductivity sensitive liquid level transducer.
    Type: Grant
    Filed: July 24, 1981
    Date of Patent: August 16, 1983
    Inventors: Paul V. Kelsey, Jr., William T. Siegel
  • Patent number: 4014812
    Abstract: Phosphors having the general formula (A.sub.1.sub.-x RE.sub.x).sub.2 Hf.sub.2 O.sub.7 are disclosed wherein A is selected from the group consisting of yttrium, gadolium, lanthanum, scandium and lutetium; RE is selected from the group consisting of praseodymium, samarium, europium, terbium, dysprosium, holmium, erbium and thulium; and x is from about 0.001 to 0.10. The phosphors are prepared by dissolving an oxide of A and an oxide of RE in a mineral acid and dissolving HfOCl.sub.2 in water and combining the two solutions. A precipitating agent such as oxalic acid is added and the precipitate is washed, dried and fired to produce the phosphors.
    Type: Grant
    Filed: May 19, 1975
    Date of Patent: March 29, 1977
    Assignee: GTE Sylvania Incorporated
    Inventors: Paul V. Kelsey, Jr., James E. Mathers
  • Patent number: 4006097
    Abstract: A phosphor composition having the general formula HfO.sub.2 :Yb with ytterbium being present in an amount of from 0.005 to 0.10 moles per mole of hafnium is disclosed. The phosphor can be prepared from the mixed oxides or from the oxalates, carbonates, or hydroxides by precipitating the latter from an aqueous solution. Firing takes place under a reducing atmosphere, preferably nitrogen, to reduce the ytterbium to the plus 2 ion. The phosphor is a bright green emitter under ultraviolet, x-radiation and cathode ray excitation.
    Type: Grant
    Filed: May 5, 1975
    Date of Patent: February 1, 1977
    Assignee: GTE Sylvania Incorporated
    Inventor: Paul V. Kelsey, Jr.