Patents by Inventor Melvyn Engel

Melvyn Engel 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).

  • High performance data tuner for video systems
    Patent number: 5731841
    Abstract: A tuner specifically adapted for recovery of a data signal injected into a video signal and then subsequently transmitted over a television channel or cable is disclosed. The tuner includes an IF local oscillator that is phase locked to the input signal sync pulses and has filters that are designed to pass through only the data bandwidth. In addition, the circuit has a low noise figure of about 1.5 dB and a third order intercept point of +35 dBm.
    Type: Grant
    Filed: May 25, 1994
    Date of Patent: March 24, 1998
    Assignee: Wavephore, Inc.
    Inventors: Glen Var Rosenbaum, Melvyn Engel
  • Software controlled adaptive delta modulator
    Patent number: 5457714
    Abstract: A delta modulator automatically adjusting the slewing rate is disclosed. In the absence of a transition in the output data of a delta modulator, a parameter used for the integrator of the delta modulator is increased. When the comparator of the modulator indicates that the feedback signal of the modulator has overshot the input signal, the parameter is decreased or reversed until the two signals are approximately equal as signalled by a 50% duty cycle.
    Type: Grant
    Filed: October 13, 1992
    Date of Patent: October 10, 1995
    Assignee: Wavephore, Inc.
    Inventors: Melvyn Engel, Michael D. Bethel, Michael J. Smith, Michael A. Sowell
  • Digitally controlled adaptive slew rate delta modulator
    Patent number: 5208595
    Abstract: A delta modulator automatically adjusting the slewing rate is disclosed. In the absence of a transition in the output data of a delta modulator, the current used for the integrator of the delta modulator is increased. When the comparator of the modulator indicates that the feedback signal of the modulator has overshot the input signal, the current is decreased or reversed until the two signals are approximately equal as signalled by a 50% duty cycle.
    Type: Grant
    Filed: August 21, 1991
    Date of Patent: May 4, 1993
    Assignee: WavePhore, Inc.
    Inventors: Melvyn Engel, Michael A. Sowell, Michael D. Bethel
  • Washing apparatus and method
    Patent number: 4925495
    Abstract: Method and apparatus for periodically cleaning washing apparatus in which washing liquid is intermittently circulated through a washing chamber adapted to contain the hand of a user. Cleaning is accomplished by intermittently circulating a cleaning liquid through the chamber while displaying a warning to potential users to not use the apparatus during the cleaning cycle. Cleaning is initiated (a) when the apparatus has been used for hand washing a predetermined number of times, (b) a predetermined period of time has elapsed since the last cleaning cycle, (c) the apparatus has been serviced, or (d) following interruption of the electrical power supply to the apparatus.
    Type: Grant
    Filed: January 25, 1988
    Date of Patent: May 15, 1990
    Assignee: Scientific Growth, Inc.
    Inventors: William E. Crisp, Melvyn Engel, Richard C. Kudlicki, Judson L. Smith