Patents by Inventor Tjepke H. Ekkelboom

Tjepke H. Ekkelboom 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 with SiO.sub.2 vessel and seal therefor
    Patent number: 5159239
    Abstract: The electric lamp has a quartz glass lamp vessel having tungsten current supply conductors extending through the wall of the lamp vessel to an electric element arranged in the lamp vessel. The current supply conductors have a continuous coating of quartz glass where they extend through the envelope wall from the interior to the exterior of the lamp vessel. The coating forms with the current supply conductor a glass/metal interface forming a gas-tight seal. The glass of the coating adjoining the interface contains thorium, hafnium, chromium, aluminum, titanium, tantalum, magnesium, calcium, strontium, barium, zirconium, lanthanum, scandium, lanthanides, niobium, boron and yttrium. The coating has a very strong adhesion to the metal and; the lamp vessel at the gas-tight seal has a great strength.
    Type: Grant
    Filed: August 27, 1991
    Date of Patent: October 27, 1992
    Assignee: U.S. Philips Corporation
    Inventors: Tjepke H. Ekkelboom, Karel M. Van Der Waarde
  • Electric lamp and seal structure therefor
    Patent number: 5077505
    Abstract: The electric lamp has a quartz glass lamp vessel (1) with molybdenum current supply conductors (3) extending to an electric element (2) arranged in the lamp vesel (1). The current supply conductors (3) have a continuous coating (4) of quartz glass which is fused to the lamp vessel (1). The coating (4) forms with the current supply conductor (3) a glass/metal interface (5). The glass of the coating (4) adjoining the interface (5) contains thorium, hafnium, chromium, aluminum, titanium, tantalum, magnesium, calcium, strontium, barium, zirconium, lanthanum, scandium, a lanthanide, niobium, boron or yttrium. The coating (4) has a very strong adhesion to the metal; the lamp vessel (1) has a great strength.
    Type: Grant
    Filed: July 13, 1990
    Date of Patent: December 31, 1991
    Assignee: U.S. Philips Corporation
    Inventors: Tjepke H. Ekkelboom, Adrianus J. A. Vermeulen
  • Method of manufacturing a drawing die
    Patent number: 4703672
    Abstract: A method of manufacturing a drawing die, in which a core of, for example, natural or synthetic diamond is clamped in the cavity intended for this purpose by deforming a tube which is made of, for example, a copper alloy to an annulus, the core being properly centered through the use of a rod-like member by means of which the core is pressed against the bottom of the cavity by a rod-like member having a pressure surface parallel to the bottom of the cavity during the deformation of the cylinder; in this way tilting of the core is precluded and it is not covered with material of the annulus in places where this is undesirable.
    Type: Grant
    Filed: June 6, 1986
    Date of Patent: November 3, 1987
    Assignee: U.S. Philips Corporation
    Inventor: Tjepke H. Ekkelboom