Patents by Inventor Alan Hugh Waller

Alan Hugh Waller 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).

  • Phosphor screen
    Patent number: 4011455
    Abstract: This invention relates to phosphor screens for converting X-rays into visible or near visible radiation. The screens comprise in a fluorescent layer a phosphor mixture which consists of a fluorohalide corresponding to the formula[Ba.sub.(1.sub.-x.sub.-y.sub.-p) Sr.sub.x Ca.sub.y Eu.sub.p ] F [Cl.sub.(1.sub.-a.sub.-b) Br.sub.a I.sub.b ] (1)whereiny .ltoreq. 0.2x + y + p .ltoreq. 1a + b .ltoreq. 10.001 .ltoreq. p .ltoreq.0.2Together with calcium tungstate or an oxychalcogenide of the formula[M.sub.(1.sub.-x) A.sub.x ].sub.2 O.sub.2 Ch (2)wherein M is a rare earth host element, A is a rare earth element different from M and which has an atomic number from 55 to 71, Ch is sulphur, selenium or tellurium and 0.001 .ltoreq. x .ltoreq. 0.2.
    Type: Grant
    Filed: March 22, 1976
    Date of Patent: March 8, 1977
    Assignee: Ciba-Geigy AG
    Inventors: Alan Hugh Waller, Peter Charles Sangway