Patents by Inventor Ashfaqui Chowdhury

Ashfaqui Chowdhury 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).

  • Optimal silicon dioxide protection layer thickness for silver lamp reflector
    Publication number: 20060007677
    Abstract: A reflector lamp has a generally parabolic shaped housing (12) with an interior surface coated with a layer (14) of silver having a protective layer (16) of a stable protective material, such as silica, disposed thereon. The thickness of the protective layer is selected such that at least one of the following relationships is satisfied: a color correction temperature of the lamp is no less than about 60K below that of the light source, and a % reflectance of the reflective interior surface is no less than about 3% below that of an equivalent reflective interior surface without the protective layer.
    Type: Application
    Filed: August 1, 2003
    Publication date: January 12, 2006
    Inventors: Rajasingh Israel, Ashfaqui Chowdhury, Tianji Zhao