Patents by Inventor Karel R. Vervecken

Karel R. Vervecken 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).

  • Low-pressure sodium discharge lamp
    Patent number: 5619090
    Abstract: The low pressure sodium discharge lamp has an outer envelope (1) in which a U-shaped discharge tube (10) is accommodated. A mica disk (20) having holes (21 ) through which pinches (11) of the discharge tube extend, keeps the discharge tube centered. The mica disk (20) has teeth (22) at its periphery, which are bent towards the lamp base (5) and clampingly engage the outer envelope. The disk allows for the outer envelope to be fused to a flared tube (3) in a drop-seal process and provides several additional features.
    Type: Grant
    Filed: June 19, 1995
    Date of Patent: April 8, 1997
    Assignee: U.S. Philips Corporation
    Inventor: Karel R. Vervecken
  • Low-pressure sodium discharge lamp having sealed current conductors with first and second glass coating
    Patent number: 5498927
    Abstract: In the low-pressure sodium discharge lamp the current conductors (3) have a first (4) and a second glass coating (6). The first coating (5) of borate glass extends from inside the discharge vessel (1) through a pinch seal (4). The second coating (6) of lime glass envelopes the first one (5) within the pinch seal (4) and extends to outside the discharge vessel (4). The occurrence of cracks in the pinch seal is thereby obviated.
    Type: Grant
    Filed: April 28, 1994
    Date of Patent: March 12, 1996
    Assignee: U.S. Philips Corporation
    Inventors: Karel R. Vervecken, Petrus M. G. Van Gennip
  • Low-pressure sodium discharge lamp having a collar-like heat shield
    Patent number: 4808877
    Abstract: The low-pressure sodium discharge lamp according to the invention has a U-shaped discharge tube (1) with seals (4, 5), through which current-supply conductors (6, 7) extend to electrodes (8, 9). A supporting member (14) fixes the discharge tube (1) in an outer bulb (10). Upright collars (18, 19) at the supporting member (14), which surround the seals (4, 5) throughout their lengths, prevent the discharge tube from becoming leaky at high-frequency operation and the lamp from reaching the end of its life prematurely.
    Type: Grant
    Filed: September 29, 1987
    Date of Patent: February 28, 1989
    Assignee: U.S. Philips Corporation
    Inventors: Adriaan Netten, Karel R. Vervecken
  • Low-pressure metal vapor discharge lamp
    Patent number: 4349764
    Abstract: The invention relates to a low-pressure metal vapor discharge lamp comprising a discharge tube and an outer bulb enveloping the discharge tube. Provided between the discharge tube and the outer bulb are a barium-containing getter and an electrical resistor which, in operation assumes a temperature of at least 500.degree. C., for cracking CH.sub.4 gas.According to the invention, the resistor is enveloped for the greater part by a ceramic tube, which prevents the electrons emitted by the hot resistor from being deposited on the exterior of the discharge tube wall.
    Type: Grant
    Filed: September 22, 1980
    Date of Patent: September 14, 1982
    Assignee: U.S. Philips Corporation
    Inventors: Peter K. R. M. Steeman, Karel R. Vervecken