Patents by Inventor Joannie Chin

Joannie Chin 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).

  • Method and apparatus for artificial weathering
    Patent number: 6626052
    Abstract: A method and apparatus for irradiating a specimen with a beam of radiation are provided. The method comprises the steps of providing an integrating sphere, a radiation source radiatively communicating with the sphere, and a specimen, the integrating sphere radiatively communicating with the specimen through an aperture in the sphere. The apparatus comprises a radiation source, an integrating sphere in radiative communication with the radiation source, and a specimen holder in radiative communication with the integrating sphere. The disclosed apparatus and method allow the irradiance of a beam of radiation impinging on the specimen to be maintained at a uniform level across the width of the beam to allow quantitative specimen evaluation.
    Type: Grant
    Filed: August 2, 1999
    Date of Patent: September 30, 2003
    Assignee: The United States of America as represented by the Secretary of the Commerce
    Inventors: Jonathan Martin, Joannie Chin