Patents by Inventor Johannis De Kok

Johannis De Kok 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).

  • High-pressure gas discharge lamp and electron emissive electrode structure therefor
    Patent number: 4052634
    Abstract: A high-pressure gas discharge lamp having an electrode consisting of a support of a high-melting metal provided with an electron emissive material. The emissive material consists mainly of one or more oxidic compounds containing (a) at least one of the rare earth metal oxides, (b) alkaline earth metal oxide in a quantity of 0.66 to 4 mole per mole of rare earth oxide and (c) at least one of the oxides of tungsten and molybdenum in a quantity of 0.25 to 0.40 mole per mole of alkaline earth metal oxide, the alkaline earth metal oxide consisting of at least 25 mol.% of barium oxide.
    Type: Grant
    Filed: June 17, 1976
    Date of Patent: October 4, 1977
    Assignee: U.S. Philips Corporation
    Inventor: Johannis De Kok