Patents by Inventor James R. Jenness, Jr.

James R. Jenness, Jr. 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: 5543814
    Abstract: A dielectric body 20 with a dielectric constant near that of air has a surface 18, a portion of a paraboloid of revolution about an axis 9--9. A layer 15 of electrically conducting material is shaped by surface 18 to the form of an antenna reflector for transmitting electromagnetic radiation, or for receiving electromagnetic radiation indicated by arrows 50. A mating body 30 covers conductive layer 15. Dielectric body 20 has a protrusion 17 that mates with a horn 40 at a specified position relative to conductive layer 15, with horn axis 8--8 perpendicular to paraboloid axis 9--9.
    Type: Grant
    Filed: March 10, 1995
    Date of Patent: August 6, 1996
    Inventor: James R. Jenness, Jr.
  • Patent number: 5426443
    Abstract: Dielectric body 20 has a back surface 18, a surface of revolution about an axis 9-9. Back surface 18 has the form of a primary reflector of an antenna for transmitting or receiving microwave or millimeter wave electromagnetic radiation. A layer 15 of electrically conductive material is in contact with back surface 18. Dielectric body 20 also has a dome 23, a coaxial surface of revolution. A layer 25 of electrically conductive material is in contact with dome 23. A horn 40 fits on a protrusion 17 of dielectric body 20. Protrusion 17 aligns horn 40 on axis 9-9. The axial dimension of dielectric body 20 maintains the proper spacing between horn 40, conductive layer 25, and conductive layer 15 to enable the assembly to function as an antenna system. In the configuration shown, conductive layer 15, in contact with surface 18, forms a paraboloidal primary reflector. Conductive layer 25 , in contact with dome 23, forms the concave ellipsoidal secondary reflector of a Gregorian antenna system.
    Type: Grant
    Filed: January 18, 1994
    Date of Patent: June 20, 1995
    Inventor: James R. Jenness, Jr.
  • Patent number: 4686430
    Abstract: A video display apparatus includes a diode modulator for correcting side pincushion raster distortion. The diode modulator drive circuit produces a vertical deflection rate parabolic voltage that modulates the horizontal deflection current to effect pincushion correction. The drive circuit includes a transistor that has its base bias established by the combination of a width control resistor and a diode. The diode has the same thermal characteristics as the transistor to provide accurate temperature compensation. A resistor is connected between the emitter of the transistor and a supply voltage to change the transistor bias point in order to enable the transistor to be cutoff.
    Type: Grant
    Filed: December 5, 1985
    Date of Patent: August 11, 1987
    Assignee: RCA Corporation
    Inventor: James R. Jennings, Jr.