Patents by Inventor Peter Petrak

Peter Petrak 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).

  • Apparatus for the relative increase of depth sharpness and improvement of resolving power of magnifying systems, particularly microscopes
    Patent number: 5059011
    Abstract: The invention relates to an apparatus for increasing depth sharpness and improving the resolving power of magnifying systems, particularly microscopes. An image-forming layer is inserted between the primary and secondary magnifiers of a composite magnifying system, in the optical path, after the object, in the image plane of the primary magnifier. The image-forming layer is comprised of independent particles dispersed in a medium, the index of refraction of which differs from that of said particles. The image-forming layer is disposed in the image plane, whereby the images coincide with the object plane of the secondary magnifier.
    Type: Grant
    Filed: March 15, 1990
    Date of Patent: October 22, 1991
    Inventors: Istvan Stuber, Geza Nagy, Peter Petrak
  • Apparatus for the relative increase of depth sharpness and improvement of resolving power of magnifying systems, particularly microscopes
    Patent number: 4927253
    Abstract: The invention relates to an apparatus for increasing depth sharpness and improving the resolving power of magnifying systems, particularly microscopes. An image-forming layer is inserted between the primary and secondary magnifiers of a composite magnifying system, in the optical path, after the object, in the image plane of the primary magnifier. The image-forming layer is comprised of independent particles dispersed in a medium, the index of refraction of which differs from that of said particles. The image-forming layer is disposed in the image plane, whereby the images coincide with the object plane of the secondary magnifier.
    Type: Grant
    Filed: January 4, 1988
    Date of Patent: May 22, 1990
    Inventors: Istvan Stuber, Geza Nagy, Peter Petrak