Patents by Inventor Francis Nathan Shaffer

Francis Nathan Shaffer 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).

  • Hexagonal hafnium, zirconium phosphate luminescent material, method of preparation, and x-ray intensifying screen containing the same
    Patent number: 4112194
    Abstract: A mixture of starting materials, corresponding to an oxide composition within an area of the ternary diagram for (Hf,Zr)O.sub.2, A.sub.2 O, P.sub.2 O.sub.5 formed by connecting end member points defined by the molar compositions: 45 (Hf,Zr)O.sub.2 - 10 A.sub.2 O - 45 P.sub.2 O.sub.5 ; 45 (Hf,Zr)O.sub.2 - 45 A.sub.2 O - 10 P.sub.2 O.sub.5 ; and 10 (Hf,Zr)O.sub.2 - 45 A.sub.2 O - 45 P.sub.2 O.sub.5, reacts to form large single crystalline essentially hexagonal particles of a new compound (Hf.sub.1-x Zr.sub.x).sub.3-y A.sub.4y (PO.sub.4).sub.4, and an aqueous-soluble second phase removable by washing. The large single crystalline hexagonal particles are useful as the luminescent material in x-ray intensifying screens, with band emission which overlaps at least partially the absorption edge of an x-ray film base to give good image resolution without crossover distortion.
    Type: Grant
    Filed: November 8, 1976
    Date of Patent: September 5, 1978
    Assignee: GTE Sylvania Incorporated
    Inventors: Charles Frederic Chenot, James Evan Mathers, Francis Nathan Shaffer
  • (Hf.sub.1-x Zr.sub.x).sub.3 P.sub.2 O.sub.11 luminescent material, method of preparation and X-ray intensifying screen containing same
    Patent number: 4068128
    Abstract: An oxide composition of 3:1 (Hf.sub.1-x Zr.sub.x)O.sub.2 :P.sub.2 O.sub.5, and having the empirical formula (Hf.sub.1-x Zr.sub.x).sub.3 P.sub.2 O.sub.11, where x is in the range of about 0 to 0.5, is an effective luminescent material for use in x-ray intensifying screens, and also an effective luminescent material host for Eu.sup.+2 blue emmissions. The luminescent material is obtained in essentially single crystalline large particles when prepared in the presence of a magnesium fluoride flux.
    Type: Grant
    Filed: December 30, 1976
    Date of Patent: January 10, 1978
    Assignee: GTE Sylvania Incorporated
    Inventors: Charles Frederic Chenot, James Evan Mathers, Francis Nathan Shaffer