Patents by Inventor David C. Koller

David C. Koller 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: 5157361
    Abstract: The present invention comprises a novel semiconductor device which further comprises a nonlinear transmission-line structure. The semiconductor device is that of a very long narrow voltage-dependent capacitor, such as a semiconductor diode or MOS capacitor, where the anode and cathode electrodes comprise the conductors of a transmission line and the depletion region comprises the dielectric of the transmission line. An input signal is applied at one end of the long, narrow structure. Such signal application results in the launch of a traveling wave traveling along the transmission-line structure. At the far end of the transmission-line structure, the signal is coupled out and applied to a load. The temporal and spatial modulation of the depletion capacitance of the semiconductor device as the traveling wave travels along the transmission-line structure results in temporal compression of the input signal.
    Type: Grant
    Filed: May 10, 1991
    Date of Patent: October 20, 1992
    Inventors: Michael E. Gruchalla, David C. Koller
  • Patent number: 4797628
    Abstract: The present invention provides a modified distributed amplifier which is capable of providing push-pull operation without the loading losses of conventional push-pull combining. The modified distributed amplifier comprises a distributed amplifier configuration and with signal inverting means, such as a wide bandwidth transmission line transformer, interconnected into both the input and output lines. The signal inverting means are most effectively placed at the electrical centers of the lines, but may be placed at any positions in the individual lines to produce optimum performance to specific applications. The separate segments of the distributed amplifier separated by the signal inverting means operate in opposed phase but the signals output to the load add in phase thus providing push-pull operation.
    Type: Grant
    Filed: March 23, 1988
    Date of Patent: January 10, 1989
    Inventors: Michael E. Gruchalla, David C. Koller
  • Patent number: 4591941
    Abstract: A double insulating protected system for use in coupling an instrumentation system to a remote power source so as to test an experimental system without posing life-threatening hazards. Connection between the instrumentation system and power source is accomplished by a pair of cascaded isolating transformers, with the connections between the two transformers being inaccessable, such as by a separate housing. The instrumentation system equipment ground is coupled to the experimental system equipment ground via a drain conductor so as to reference the former system to the same potential as that of the latter. The system provides a double insulation system such that a primary-to-secondary, primary-to-frame, or secondary-to-frame fault occurring in either of the transformers, or similar faults in the instrumentation system, will not result in a life-threatening situation to the system user.
    Type: Grant
    Filed: September 21, 1983
    Date of Patent: May 27, 1986
    Assignee: EG&G Washington Analytical Services Center Inc.
    Inventors: Michael E. Gruchalla, David C. Koller