Patents by Inventor Roman Derc

Roman Derc 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).

  • Print head and drive circuit
    Patent number: 4396304
    Abstract: Wire printing apparatus includes a print head having at least one print wire and associated actuating mechanism and drive circuit. In the drive circuit a capacitor is charged to a predetermined voltage through an inductance and then discharged through the coil of an electromagnet in the actuating mechanism. The current through the coil is arranged to rise and then fall. The circuit permits optimization to maximize the proportion of the energy input to the drive circuit which is transferred to the print wire.
    Type: Grant
    Filed: November 24, 1981
    Date of Patent: August 2, 1983
    Assignee: International Computers Limited
    Inventors: Keith B. Davenport, Roman Derc
  • Temperature compensation for data storage apparatus
    Patent number: 4121265
    Abstract: The positioning of the head positioning mechanism of a magnetic disc file is controlled by a servo system arrangement which involves separately monitoring the temperature conditions in the vicinity of the center track of a disc file and the head positioning mechanism; producing related electrical signals which are used in conjunction with signals defining the address of a required track of a disc and a reference voltage to obtain a temperture corrected signal which is used to produce a head positioning control signal.
    Type: Grant
    Filed: January 26, 1977
    Date of Patent: October 17, 1978
    Assignee: Data Recording Instrument Co., Ltd.
    Inventor: Roman Derc