Patents by Inventor David R. S. Altham

David R. S. Altham 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).

  • Method of, and circuit for, controlling the discharge of a battery
    Patent number: 6351100
    Abstract: A power supply circuit comprises a pre-regulator circuit (20) including an energy store (19). A control circuit (4) controls the current flow from a battery (18), creating an intermittent supply of current to the energy store (19) from which current is supplied to a voltage regulator (7) and application circuit (2, 4, 5, 6, 8 and 9). The energy store may be bypassed when desired, for example to maximise efficiency when the battery is approaching the end of its useful life.
    Type: Grant
    Filed: November 13, 2000
    Date of Patent: February 26, 2002
    Assignee: U.S. Philips Corporation
    Inventor: David R. S. Altham