Patents by Inventor Albert Leendert Nicolaas Stevels

Albert Leendert Nicolaas Stevels 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).

  • X-ray luminescent screen
    Patent number: 4075495
    Abstract: Luminescent screen, in particular X-ray image intensifier screen, provided with a luminescent alkaline earth metal fluoro-halide which is activated by Eu.sup.2+, contains samarium and has a composition defined by the formula Me.sub.1-p-q Eu.sub.p Sm.sub.q FX, where Me represents barium and/or strontium and X represents chlorine, bromine and/or iodine. Up to 20 mol % of the Ba and/or Sr can be replaced by Ca. Furthermore 0.001 .ltoreq. p .ltoreq. 0.20; 0.001 .ltoreq. q.ltoreq. 0.10; 0.02 .ltoreq. q/p .ltoreq. 0.50.
    Type: Grant
    Filed: September 23, 1975
    Date of Patent: February 21, 1978
    Assignee: U.S. Philips Corporation
    Inventors: Albert Leendert Nicolaas Stevels, Agnes Desiree Maria Schrama-de Pauw
  • Luminescent material
    Patent number: 4003845
    Abstract: Luminescent cerium- and manganese-activated aluminate which is defined by the formulaLa.sub.1.sub.-x.sub.-p Ba.sub.x Ce.sub.p Al.sub.y.sub.-q Mn.sub.q O.sub.1.5y.sub.+1.5.sub.-0.5x.sub.- 0.5qWhere10 .ltoreq. y .ltoreq. 130.10 .ltoreq. x .ltoreq. 0.750.05 .ltoreq. p .ltoreq. 0.75x+ p .ltoreq. 0.900.10 .ltoreq. q .ltoreq. 0.
    Type: Grant
    Filed: April 9, 1976
    Date of Patent: January 18, 1977
    Assignee: U.S. Philips Corporation
    Inventors: Petrus Franciscus Josef VAN DEN Boom, Albert Leendert Nicolaas Stevels