Patents by Inventor Philip Norris Douglas

Philip Norris Douglas 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).

  • Hand held voltage detection probe
    Patent number: 7030599
    Abstract: A switchless, hand-held probe and method for detecting and alerting a user to the presence of an AC voltage on a conductor that minimizes the intermittent activation of the probe's indicator due to static charge build-up. The probe includes an antenna, an indicator, and activation and detection circuitry. The probe alerts a user through the use of an indicator to the presence of electrical energy on a conductor. The antenna senses the electrical energy radiated from the conductor. When the electrical energy sensed by the antenna satisfies a particular measurement threshold a plurality of times during a period of time, the activation and detection circuitry activates the indicator.
    Type: Grant
    Filed: September 29, 2004
    Date of Patent: April 18, 2006
    Assignee: Santronics, Inc.
    Inventor: Philip Norris Douglas