Patents by Inventor Sau K. Lo

Sau K. Lo 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).

  • Narrow band selective absorption filter
    Patent number: 5270854
    Abstract: A solid state form of a dye-solution absorption filter is disclosed. Physical vapor depositable (i.e., evaporable) dyes are codeposited with a polyester matrix in a vacuum system to randomly disperse dye molecules in a solid dilutant. The dyes are selected to absorb at the wavelengths of interest. Dilution in a transparent matrix affords narrow band absorption and good out of band transmittance. Multilayer configurations allow absorption of a plurality of wavelengths. The filter coating conforms to curved and sharply contoured surfaces and layers only 10 microns thick afford very high absorptance.
    Type: Grant
    Filed: August 8, 1991
    Date of Patent: December 14, 1993
    Assignee: Honeywell Inc.
    Inventors: James C. Lee, David Greenlaw, Sau K. Lo
  • Narrow band selective absorption filter
    Patent number: 5102213
    Abstract: A solid state form of a dye-solution absorption filter is disclosed. Physical vapor depositable (i.e., evaporable) dyes are codeposited with a polyester matrix in a vacuum system to randomly disperse dye molecules in a solid dilutant. The dyes are selected to absorb at the wavelengths of interest. Dilution in a transparent matrix affords narrow band absorption and good out of band transmittance. Multilayer configurations allow absorption of a plurality of wavelengths. The filter coating conforms to curved and sharply contoured surfaces and layers only 10 microns thick afford very high absorptance.
    Type: Grant
    Filed: February 28, 1990
    Date of Patent: April 7, 1992
    Assignee: Honeywell Inc.
    Inventors: James C. Lee, David Greenlaw, Sau K. Lo
  • Narrow band selective absorption filter
    Patent number: 4935166
    Abstract: A solid state form of a dye-solution absorption filter is disclosed. Physical vapor depositable (i.e., evaporable) dyes are codeposited with a polyester matrix in a vacuum system to randomly disperse dye molecules in a solid dilutant. The dyes are selected to absorb at the wavelengths of interest. Dilution in a transparent matrix affords narrow band absorption and good out of band transmittance. Multilayer configurations allow absorption of a plurality of wavelengths. The filter coating conforms to curved and sharply contoured surfaces and layers only 10 microns thick afford very high absorptance.
    Type: Grant
    Filed: September 17, 1985
    Date of Patent: June 19, 1990
    Inventors: James C. Lee, David Greenlaw, Sau K. Lo
  • Optical filter
    Patent number: 4548473
    Abstract: An optical filter comprising a first substance which is substantially transparent to light within a selected first frequency range and having a first index of refraction; and a second substance which has at least one resonance frequency within said first frequency range and having a second index of refraction which is substantially the same as said first index of refraction at all of the frequencies within said first frequency range except for frequencies near said resonance frequency.
    Type: Grant
    Filed: May 12, 1983
    Date of Patent: October 22, 1985
    Assignee: Honeywell Inc.
    Inventors: Sau K. Lo, Ronald E. Peterson