Patents by Inventor Rafael Pelc

Rafael Pelc 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).

  • Self-timing and self-compensating print wire actuator driver
    Patent number: 4667117
    Abstract: There is disclosed an improved drive circuit for a print element actuator wherein the current applied to the actuator has a fast rise mode which is terminated when a predetermined level has been reached. Current is allowed to slowly decay through the circuit until it reaches a second and lower predetermined level. The circuit is self-timing and self-compensating for variations in voltage or actuator impedance.
    Type: Grant
    Filed: October 31, 1984
    Date of Patent: May 19, 1987
    Assignee: International Business Machines Corporation
    Inventors: Gilbert B. Nebgen, Rafael Pelc
  • Self-switching bidirectional digital line driver
    Patent number: 4315167
    Abstract: A logic driver circuit repowers signals in either direction along a line, without requiring any external direction-control signal. Two back-to-back driver halves each include a gate, an open-collector transmitter and a latch. The latch is connected to the gate and transmitter to prevent race conditions.
    Type: Grant
    Filed: September 10, 1979
    Date of Patent: February 9, 1982
    Assignee: International Business Machines Corporation
    Inventor: Rafael Pelc
  • Logic driver circuit with output protection
    Patent number: 3979643
    Abstract: A resistor senses low-level drive current is a logic circuit. When the output is shorted, excessive drive current turns on a sensor transistor, which causes drive voltage to the output stage to be clamped to ground, and to remain clamped until the fault is removed.
    Type: Grant
    Filed: February 3, 1975
    Date of Patent: September 7, 1976
    Assignee: International Business Machines Corporation
    Inventor: Rafael Pelc