Patents by Inventor Andrzej M. Sendyk

Andrzej M. Sendyk 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: 7872945
    Abstract: This invention applies to the means whereby capacitance changes due to varying temperature and/or pressure in a piezoelectric transducer used for acoustic telemetry in a drilling environment is dynamically offset by modifying one or more parameters associated with the drive or control circuitry of said transducer. The object of the invention is to closely maintain the transducer in a resonant mode, thereby ensuring optimum energy consumption.
    Type: Grant
    Filed: April 11, 2007
    Date of Patent: January 18, 2011
    Assignee: XAcT Downhole Telemetry, Inc.
    Inventors: Paul L. Camwell, Edwin I. Hildebrandt, Andrzej M. Sendyk
  • Patent number: 4123709
    Abstract: An adaptive delta modulation system wherein the input analog signal is periodically sampled and a binary bit is generated for each period, the logic level of the binary bit being dependent on whether the sampled signal is greater or smaller than the approximate signal of the previous sample. Decoding apparatus converts the stream of binary bits to approximate the analog signal by periodically charging or discharging a capacitor integrator by predetermined variable steps. The charging or discharging of the integrator during each period is determined by the logic level of the binary bits, whereas the increase or decrease in step size for successive periods is determined by successive similar signal binary bits or successive dissimilar bits, respectively. The increase or decrease in step size is achieved by storing a binary step size number S in a register and adding or subtracting a fraction of the number to or from itself during each period, producing a new step size number for each period.
    Type: Grant
    Filed: January 24, 1977
    Date of Patent: October 31, 1978
    Assignee: Canadian Patents and Development Limited
    Inventors: David E. Dodds, Andrzej M. Sendyk, Donald B. Wohlberg
  • Patent number: 3993877
    Abstract: An automatic dialer which receives address digits dialed from a telephone set and outdials a destination number. A programmable Send Only M.O.S. Memory stores a plurality of destination numbers at address locations. The dialer can be connected to a telephone line at the central office, at the subscriber's location, or anywhere on the line, to a PBX trunk, either at the PBX or the control office. The dialer can be made transparent to dialed digits upon receipt of a predetermined digit.
    Type: Grant
    Filed: June 16, 1975
    Date of Patent: November 23, 1976
    Assignee: Sed Systems Ltd.
    Inventors: Andrzej M. Sendyk, Dennis W. Johnson