Patents by Inventor Harold E. Holden

Harold E. Holden 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).

  • Microfilm reader with microfilm and reticle images provided to each of two binocular eyepieces
    Patent number: 5024512
    Abstract: A process for high resolution high accuracy photoreduction of radiographs, a rotatable photographic copy stand for the photoreduction process, and a high resolution high accuracy microfilm reader with built-in measuring capabilities are shown. The photoreduction process employs a camera with high precision optics, a high resolution copy film, and a first developing solution containing 0.014 to 0.025 moles per liter of a 3-pyrazolidone as the primary developing agent plus a lesser amount of a secondary developing agent, in a reversal process, to yield positive images having gamma values of 1.00 to 1.05. The copy stand has multiple workstations mounted on a rotatable frame, and several lightboxes.
    Type: Grant
    Filed: February 7, 1989
    Date of Patent: June 18, 1991
    Assignee: American Photo Systems, Inc.
    Inventors: Arnold H. Greene, Harold E. Holden
  • High precision photoreduction process and related apparatus
    Patent number: 4849794
    Abstract: A process for high resolution high accuracy photoreduction of radiographs, a rotatable photographic copy stand for the photoreduction process, and a high resolution high accuracy microfilm reader with built-in measuring capabilities are shown. The photoreduction process employs a camera with high precision optics, a high resolution copy film, and a first developing solution containing 0.014 to 0.025 moles per liter of a 3-pyrazolidone as the primary developing agent plus a lesser amount of a secondary developing agent, in a reversal process, to yield positive image having gamma values of 1.00 to 1.05. The copy stand has multiple workstations mounted on a rotatable frame, and several lightboxes.
    Type: Grant
    Filed: July 20, 1987
    Date of Patent: July 18, 1989
    Assignee: Micro-Radiographs, Inc.
    Inventors: Arnold H. Greene, Harold E. Holden