Patents by Inventor Krishnaiyer Swaminathan

Krishnaiyer Swaminathan 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).

  • Bright field-dark field illumination system
    Patent number: 4232937
    Abstract: An illumination system for bright field/dark field microscopy has a swinging deflector which is normally positioned on the optical axis when bright field microscopy is used and which is swung off the optical axis when dark field microscopy is used. When the deflector is swung off the optical axis an alternate illumination axis is utilized to provide a reduced portion of the observation axis having coaxial counterflowing light passing there along.
    Type: Grant
    Filed: October 16, 1978
    Date of Patent: November 11, 1980
    Assignee: American Optical Corporation
    Inventors: Krishnaiyer Swaminathan, Milton H. Sussman
  • Achromatic aplanatic condenser
    Patent number: 4060306
    Abstract: An Achromatic Aplanatic Condenser having a numerical aperture of 1.30 has 3 components.
    Type: Grant
    Filed: December 16, 1974
    Date of Patent: November 29, 1977
    Assignee: American Optical Corporation
    Inventor: Krishnaiyer Swaminathan