Patents by Inventor Don M. Gilbert

Don M. Gilbert 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: 4498791
    Abstract: A multicopy impact printer has a wire matrix stored energy printhead having circuitry for reducing the power requirement of the printhead. A permanent magnet is incorporated in the printhead to flex leaf springs each of which is attached to the corresponding activation end of a respective one of a plurality of print members. A coil is provided for each print member, being activated when selected, to provide a magnetic field in opposition to the magnetic field of the permanent magnet and of an amplitude sufficient to release the flexed leaf spring. The opposing field diverts the field of the magnetic coil into paths away from the activated coil, thereby increasing its intensity and requiring more current in other selected coils to release the corresponding flexed leaf springs. A common coil is connected at one end to one end of each of the printer element coils and wound and positioned to provide a field in opposition to that of the permanent magnet.
    Type: Grant
    Filed: March 28, 1983
    Date of Patent: February 12, 1985
    Assignee: Texas Instruments Incorporated
    Inventor: Don M. Gilbert