Patents by Inventor Aafko Hendrik Tuin

Aafko Hendrik Tuin 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 mercury vapor discharge lamp and compact fluorescent lamp
    Patent number: 7719177
    Abstract: A low-pressure mercury vapor discharge lamp has a light-transmitting discharge vessel (10) enclosing, in a gastight manner, a discharge space (11) provided with a filling of mercury and a rare gas. The discharge vessel (10) comprises discharge means for maintaining a discharge in the discharge space (13). At least a part of an inner wall (12) of the discharge vessel (10) is provided with a protective layer (16). The discharge vessel (10) is provided with a luminescent layer (17) comprising a luminescent material. The luminescent layer (17) further comprises inorganic softening particles (27) with a softening point above 450° C. The size of the softening particles (27) is in the range from 0.01 to 10 gm. Preferably, the softening particles (27) are selected from the group formed by strontium borate, barium borate, yttrium borate, yttrium-strontium borate and calcium pyrophosphate.
    Type: Grant
    Filed: February 2, 2005
    Date of Patent: May 18, 2010
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Aafko Hendrik Tuin, Ingrid Jozef Maria Snijkers-Hendrickx, Ronald Arjan Van Den Brakel
  • Low-Pressure Mercury Vapor Discharge Lamp and Compact Fluorescent Lamp
    Publication number: 20080297024
    Abstract: A low-pressure mercury vapor discharge lamp has a light-transmitting discharge vessel (10) enclosing, in a gastight manner, a discharge space (11) provided with a filling of mercury and a rare gas. The discharge vessel (10) comprises discharge means for maintaining a discharge in the discharge space (13). At least a part of an inner wall (12) of the discharge vessel (10) is provided with a protective layer (16). The discharge vessel (10) is provided with a luminescent layer (17) comprising a luminescent material. The luminescent layer (17) further comprises inorganic softening particles (27) with a softening point above 450° C. The size of the softening particles (27) is in the range from 0.01 to 10 gm. Preferably, the softening particles (27) are selected from the group formed by strontium borate, barium borate, yttrium borate, yttrium-strontium borate and calcium pyrophosphate.
    Type: Application
    Filed: February 2, 2005
    Publication date: December 4, 2008
    Applicant: KONINKLIJKE PHILIPS ELECTRONIC, N.V.
    Inventors: Aafko Hendrik Tuin, Ingrid Jozef Maria Snijkers-Hendrickx, Ronald Arjan Van Den Brakel