Patents by Inventor Zdenek Holy

Zdenek Holy 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).

  • System for winding a cone of yarn or the like
    Patent number: 5035369
    Abstract: A system for winding filamentary material around a cone. The system includes: a drive ring for rotating the cone and a lateral ring for supporting the cone. The lateral ring is rotatable with respect to the drive ring. The angular velocity of the cone is controlled by controlling the rotation of the lateral ring responsive to the tension of the filimentary material and/or responsive to the diameter of the cone.
    Type: Grant
    Filed: May 24, 1989
    Date of Patent: July 30, 1991
    Assignee: Elitex koncern textilniho strojirenstvi
    Inventors: Jaroslav Beran, Milos Pavlu, Vladimir Prasil, Zdenek Holy, Frantisek Pesek, Zdenek Vitamvas, Josef Vitak
  • Active impedance line feed circuit
    Patent number: 4764956
    Abstract: A typical active impedance line feed circuit includes tip and ring amplifiers being controlled in response to signals at tip and ring voltage taps by control circuit to exhibit a.c. impedance and d.c. resistance characteristics for the purpose of supplying energizing current via tip and ring terminals for tip and ring leads of a two wire communication line. In one example of the active impedance line feed circuit, improved operational tolerance of longitudinal interference and of a ground fault condition is provided by a d.c. amplifier being responsive to voltages at the tip and ring terminals. The circuit is characterized in that an inverting input of the d.c. amplifier is connected via resistors to the tip and ring voltage taps. In operation, the d.c.
    Type: Grant
    Filed: July 1, 1987
    Date of Patent: August 16, 1988
    Assignee: Northern Telecom Limited
    Inventors: Reinhard Rosch, Stanley D. Rosenbaum, Calvin Plett, Zdenek Holy
  • Active impedance line feed circuit
    Patent number: 4532381
    Abstract: Normal operating range of an active impedance line feed circuit is extended to at least that of a prior art passive resistance line feed circuit. The active impedance line feed circuit includes tip and ring feed resistors in series with outputs of tip and ring amplifiers for coupling a.c. signals to a two wire communication line with an effective source impedance as defined by an a.c. feedback network in response to differential currents in the communication line. Effective output direct current incremental resistances of the tip and ring amplifiers are controlled by a d.c. control circuit connected across the tip amplifier. In an instant of an OFF HOOK communication line of less than a certain resistance a predetermined constant direct current is supplied by controlling the output direct current incremental resistances to be high.
    Type: Grant
    Filed: February 13, 1984
    Date of Patent: July 30, 1985
    Assignee: Northern Telecom Limited
    Inventors: Stanley D. Rosenbaum, Zdenek Holy