Patents Examined by Sandra H. O'Shea
  • Display screen having aluminum phosphate barrier layer and method of manufacture
    Patent number: 4551652
    Abstract: Corrosion of an aluminium film on the display screen of a display tube as a result of an electro-chemical reaction between water and aluminium is substantially prevented by providing the aluminium with an aluminium phosphate layer at the area where it adjoins the carbon particles. This may be done by rinsing or spraying the carbon particles with an at most 2% by weight phosphoric acid solution in water prior to or after providing the aluminium film.
    Type: Grant
    Filed: June 1, 1982
    Date of Patent: November 5, 1985
    Assignee: U.S. Philips Corporation
    Inventors: Johannes M. A. A. Compen, Cornelis Maan