Patents by Inventor Evan L. Craig

Evan L. Craig 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).

  • Patent number: 5253676
    Abstract: A controlled orifice for a hydraulic pressure control valve has a plunger and a conic orifice seat. The plunger has a head which forms a stagnation zone, and a rim with surfaces that define a sharp edge, these surfaces making an angle of at least 30 degrees with the conic bore orifice seat. A conic back surface extends to the plunger stem. The sharp edge of the rim forms a small annular vena contracta so that the regions where rapid flow is experienced are kept as small as possible. This reduces undesirable Bernoulli forces.
    Type: Grant
    Filed: August 13, 1992
    Date of Patent: October 19, 1993
    Assignee: Moog Controls, Inc.
    Inventor: Evan L. Craig
  • Patent number: 4757328
    Abstract: There is described a printing head useful in an ink-jet printer to print on a recording medium, comprising jet forming means for forming spaced drops of ink, charging means adjacent the forming means for inducing an electric charge in selected some of the drops, the charging means being mounted on an electrically non-conductive plate, and drop-catcher means for catching the charged drops. The drop-catcher means is integral with the plate mounting the charging means, and is disposed downstream from the charging means.
    Type: Grant
    Filed: February 6, 1987
    Date of Patent: July 12, 1988
    Assignee: Eastman Kodak Company
    Inventors: Hilarion Braun, Evan L. Craig
  • Patent number: 4614948
    Abstract: In a continuous ink jet printing apparatus, an ink circulating system allows maintenance of the ink supply reservoir at approximately atmospheric pressure while providing for positive withdrawal of ink from the catcher and/or print head outlet of the apparatus. The system is operable with a single pump. To achieve such positive withdrawal of ink, elements are provided in a bypass line extending from the supply pump outlet to the atmospheric region of the ink reservoir or in the passage from that region of the ink reservoir to the pump intake line, for generating a region(s) of sub-atmospheric pressure, and such region(s) are coupled to the catcher and/or print head outlet.
    Type: Grant
    Filed: April 12, 1985
    Date of Patent: September 30, 1986
    Assignee: Eastman Kodak Company
    Inventors: James A. Katerberg, Evan L. Craig, David A. Huliba