Patents Represented by Attorney Charles E. Pfund, Esq.
  • Patent number: 3935828
    Abstract: In a sailboat, signals representing relative wind speed and slot wind speed are differentially compared to obtain a signal that represents the increase in wind speed in the slot over the relative wind speed approximately independent of incremental changes in relative wind speed approximately independent of incremental changes in relative wind speed. By observing the differential quantity upon relative adjustment of the sails, a sail setting can be selected to give maximum slot effectiveness. An instantaneously responsive thrust indicator is provided as a guide to overall sail trim effectiveness for maximum driving force on the hull.
    Type: Grant
    Filed: April 8, 1974
    Date of Patent: February 3, 1976
    Inventor: Charles E. Pfund
  • Patent number: 3936151
    Abstract: In a correction lens wherein the effective surface thereof has at least a lens member having no island shaped portion, said member being defined by the step shaped border line never closing by themselves to form an island shaped lens segment on said correction lens surface.
    Type: Grant
    Filed: December 4, 1973
    Date of Patent: February 3, 1976
    Assignee: Hitachi, Ltd.
    Inventors: Eiichi Yamazaki, Toshio Ueda, Koichi Maruyama, Iwao Ogura
  • Patent number: 3936302
    Abstract: A fluorescent screen including a plurality of parallel stripes of three colour phosphors is prepared by projecting light from a linear light source positioned in parallel with the stripes on photosensitive substances coated on the inner surface of the panel through a plurality of stripe shaped perforations of a colour selecting member, each divided into a plurality of slit shaped sections by means of bridges. The linear light source is constituted by reciprocating a point light source in parallel with the stripe shaped perforations.
    Type: Grant
    Filed: February 7, 1973
    Date of Patent: February 3, 1976
    Assignee: Hitachi, Ltd.
    Inventors: Yasuji Takami, Kenji Fukuda, Eiichi Yamazaki
  • Patent number: 3936692
    Abstract: In an electron gun assembly for use in multi-beam type cathode ray tube of the type including a plurality of grid structures in which the groups of the grid electrodes of respective guns are formed as integral units, the grid electrodes of each group are impressed with the same potential and perform the same function, and wherein an electron lens is formed between adjacent grid structures, an assembly of a plate member or a superposed plate member is secured to one or both of the opposing ends of the grid structures. Each plate member is provided with a plurality of openings which are arranged to correspond to a predetermined arrangement of a plurality of electron guns, and each opening is surrounded by an axial edge. The edges function to prevent electric fields formed by the openings from being affected by the side walls of the grid structures opposing the openings thereby decreasing the astigmatism of the main electron lens.
    Type: Grant
    Filed: August 5, 1974
    Date of Patent: February 3, 1976
    Assignee: Hitachi, Ltd.
    Inventors: Yukihiro Izumida, Kihachiro Koizumi, Yoshihiko Miyata
  • Patent number: 3936610
    Abstract: Sound signals are processed for compression or expansion utilizing storage and frequency transformation into storage delay lines operated alternately to transform alternate segments of the sound signal respectively with the outputs of the two delay lines combined to produce a continuous sound signal output with the frequency components thereof transformed.
    Type: Grant
    Filed: May 28, 1974
    Date of Patent: February 3, 1976
    Assignees: Cambridge Research and Development Group, Sanford D. Greenberg, DT Liquidating Partnership, Murray M. Schiffman
    Inventor: Murray M. Schiffman
  • Patent number: 3931492
    Abstract: The thermal print head comprises a substrate, a semiconductor wafer fabricated thereover, a plurality of junctions formed on the semiconductor wafer, and electrodes to supply an inverse current to the junctions. The junctions are arranged so as to correspond to the pattern of the symbol, such as letters, to be printed. Each of the junctions is used as a heating element. Heat is evolved at the junction when the inverse current flows through the potential barrier which is formed at the junction. The heat evolved is used for the heating element.
    Type: Grant
    Filed: June 7, 1973
    Date of Patent: January 6, 1976
    Assignee: Nippon Telegraph and Telephone Public Corporation
    Inventors: Rikuo Takano, Mitsushi Matsunaga, Akira Yoshida, Kiyoshi Nawata, Shigehisa Nakaya