Patents by Inventor Willibrordus H. M. M. Van De Spijker

Willibrordus H. M. M. Van De Spijker 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 adhesion layer and interference layer
    Patent number: 5680001
    Abstract: The electric lamp has a quartz glass lamp vessel in which a light source is accommodated. The lamp vessel is covered by an interference film which has layers of alternatingly silica and a material of relatively high refractive index. A silica containing adhesive layer is in between the lamp vessel and the film. The adhesive layer has a content of boron oxide and/or phosphorus oxide.
    Type: Grant
    Filed: August 18, 1995
    Date of Patent: October 21, 1997
    Assignee: U.S. Philips Corporation
    Inventors: Cornelis A.M. Mulder, Willibrordus H. M. M. Van De Spijker, Cornelis G. Visser