Patents by Inventor Joannes Terheijden

Joannes Terheijden 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
    Patent number: 5541471
    Abstract: An electric lamp has a light source which has an envelope of doped quartz glass. The quartz glass including silicon, cerium, titanium, europium and aluminium in oxidic form. Cerium accounts for 0.1-0.2, titanium for 0.01-0.04, europium for 0.03-0.2 and aluminium for at most 0.8 at % of the cationogenous elements. The aluminium/europium atomic ratio lies in the region from 3 to 8. The doped quartz glass is at least substantially transparent to visible radiation and at least substantially impervious to UV radiation.
    Type: Grant
    Filed: December 12, 1994
    Date of Patent: July 30, 1996
    Assignee: U.S. Philips Corporation
    Inventors: Joannes Terheijden, Josephus J. Timmermans
  • Electric incandescent lamp with a quartz glass lamp vessel and quartz glass tube for said lamp
    Patent number: 5523650
    Abstract: The electric incandescent lamp has a quartz glass lamp vessel (1) or envelope (4') around the lamp vessel, which has a red coloured dope in the area at the side of the incandescent body (3). The quartz glass with red dope contains samarium.sup.II oxide, aluminium oxide and silicon dioxide, the analysis of the glass in its oxidised form being Sm.sub.2 O.sub.3 to 1 to 3% by weight, Al.sub.2 O.sub.3 up to 3% by weight, rest SiO.sub.2, the molar ratio Al/Sm being at least 2.
    Type: Grant
    Filed: September 7, 1994
    Date of Patent: June 4, 1996
    Assignee: U.S. Philips Corporation
    Inventors: Joannes Terheijden, Peter E. M. Van Den Eijn-Den