Patents by Inventor Mark E. Preiser

Mark E. Preiser 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: 4169213
    Abstract: A method of and apparatus for modulating, demodulating, and ordering independent signals transmitted over a single link provides mux-demux capability by asymmetric average interpulse spacing so that the information will be received only by the proper listening station despite interruptions or errors in transmission. In the two signal embodiment, a master oscillator provides an asymmetric carrier pulse train to a pair of ramp generators, one leading pulse edge triggered and the other trailing edge triggered. The ramps pulse position modulate the signals by means of a pair of comparators. The modulated outputs of the comparators are applied to an OR gate which combines the pulses to provide a time division multiplexed stream of modulated data having an asymmetric average interpulse spacing.
    Type: Grant
    Filed: June 1, 1978
    Date of Patent: September 25, 1979
    Assignee: Santa Barbara Research Center
    Inventors: Richard A. Dye, Robert J. Cinzori, Mark E. Preiser
  • Patent number: 4142116
    Abstract: A multi-channel adaptive threshold circuit usable to extract affirmative detection impulses from a plurality of detection circuits each having a different background noise level. The circuit comprises a plurality of analogous detection circuits whose outputs are coupled in parallel between a threshold circuit and threshold activation device such as a switch which grounds all outputs when in the ON position. The input to each detection circuit, which is a composite of sporadic affirmative return pulses and continuous background noise, is passed through a unidirectional conducting device, such as a base-to-emitter junction of a transistor, to charge a capacitor to a value which is a function of the continuous background noise. When the threshold activation device is turned off, the output plate of the capacitor of each detection circuit is applied to a fixed threshold circuit.
    Type: Grant
    Filed: May 18, 1977
    Date of Patent: February 27, 1979
    Assignee: Hughes Aircraft Company
    Inventors: Arthur H. Hardy, Jr., Mark E. Preiser