Patents by Inventor Colin L. R. Catherall

Colin L. R. Catherall 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).

  • Infra-red phosphors
    Patent number: 4806825
    Abstract: A phosphor comprises a chromium activated alkaline earth aluminate having a hexagonal crystal structure and incorporates divalent europium as a sensitizer. The phosphor may also incorporate one or more of divalent manganese and/or zinc and/or magnesium. Such a phosphor emits in the infra-red.
    Type: Grant
    Filed: May 19, 1988
    Date of Patent: February 21, 1989
    Assignee: Thorn EMI plc
    Inventors: Colin L. R. Catherall, Martin J. Fuller
  • Infra-red phosphors and fluorescent lamp containing the same
    Patent number: 4719387
    Abstract: An infra-red emissive phosphor consists of chromium activated cerium manganese aluminate having a hexagonal crystal structure and represented by the general formula: ##EQU1## where x is from 0.3 to 3.0, y is from 0.01 to 2.0, z is from 0.001 to 0.3 and R is manganese, in which up to 95 atomic percent of the manganese may be replaced by an equivalent amount of zinc or magnesium or both.
    Type: Grant
    Filed: November 13, 1986
    Date of Patent: January 12, 1988
    Assignee: Thorn EMI plc
    Inventor: Colin L. R. Catherall