Patents by Inventor Petrus J. M. Dohmen

Petrus J. M. Dohmen 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).

  • Electric lamp and glass composition
    Patent number: 4691142
    Abstract: The invention relates to a glass composition which can be used as an intermediate glass for sealing tunsten current supply wires in borosilicate glass, for example, for use in discharge lamps. The intermediate glass has a coefficient of expansion of from 38 to 44.10.sup.-7 K.sup.-1 and does not contain any sodium oxide, potassium oxide and lead oxide. Favorable thermal properties are obtained if the composition of the intermediate glass is kept within narrow limits.The invention also relates to an electric lamp in which the intermediate glass is used.
    Type: Grant
    Filed: September 3, 1985
    Date of Patent: September 1, 1987
    Assignee: U.S. Philips Corporation
    Inventor: Petrus J. M. Dohmen