Patents by Inventor Frederick R. Holt

Frederick R. Holt 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).

  • Disk drive with automatic disc clamping and ejecting
    Patent number: 4466033
    Abstract: A floppy disk drive with automatic disc clamping and ejection is disclosed. The movement of the linear actuator is used to provide both the clamping and ejection, without other drive means. A pair of magnetic heads, positioned on opposing sides of a drive wheel, are fixed to a carriage, one engages the upper surface of the disc, the other the lower surface. Neither head moves relative to the other. The drive components are easily assembled providing a relatively inexpensive, yet reliable drive.
    Type: Grant
    Filed: February 24, 1982
    Date of Patent: August 14, 1984
    Assignee: Apple Computer, Inc.
    Inventors: Richard Jordan, William Bull, Robert L. Ciardella, Robert Taggart, Frederick R. Holt
  • DC Power supply
    Patent number: 4130862
    Abstract: A direct current (DC) power supply of the single-ended flyback type particularly suited for providing power for integrated circuits is described. The power supply is self-exciting and thus does not employ an auxiliary drive or oscillator. The starting/restarting circuitry provides protection against faults. Because of this fault protection, a relatively simple over-voltage circuit is employed at the output of the supply. An additional primary winding is used to provide protection for no-load conditions.
    Type: Grant
    Filed: February 1, 1978
    Date of Patent: December 19, 1978
    Assignee: Apple Computer, Inc.
    Inventor: Frederick R. Holt