Patents by Inventor Peter Leferson

Peter Leferson 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).

  • Apparatus and circuit for use with capacitive presence detection systems
    Patent number: 7193522
    Abstract: A capacitance presence sensing apparatus (10) having a fail-safe circuit (13) and modular units (100). The fail-safe circuit (13) includes delivering a low voltage (FIG. 5) to a sensor and connecting voltage through a resistor to an oscillator (18). An opener ground in the circuit changes frequency of the oscillator (18) to indicate a problem With the fail-safe circuit (13). The apparatus also contains a number of inductance coils (28) which may be selected to tune the frequency of the system. Circuitry is provided in cards which may be combined together with receiver transmitter cards (106) and to easily facilitate the use of the system for desired applications.
    Type: Grant
    Filed: October 2, 2001
    Date of Patent: March 20, 2007
    Assignee: Invisa, Inc.
    Inventors: Stephen Michael, Scott Tannehill, Peter Leferson
  • Apparatus and circuit for use with capacitive presence detection systems
    Publication number: 20040061610
    Abstract: A capacitance presence sensing apparatus (10) having a fail-safe circuit (13) and modular units (100). The fail-safe circuit (13) includes delivering a low voltage (FIG. 5) to a sensor and connecting voltage through a resistor to an oscillator (18). An opener ground in the circuit changes the frequency of the oscillator (18) to indicate a problem With the fail-safe circuit (13). The apparatus also contains a number of inductance coils (28) which may be selected to tune thc frequency of the system. Circuitry is provided in cards which may be combined together with receiver transmitter cards (106) to easily facilitate the use of the system for desired applications.
    Type: Application
    Filed: September 9, 2003
    Publication date: April 1, 2004
    Inventors: Stephen Michael, Scott Tannehill, Peter Leferson