Patents by Inventor Ivan J. Nelson

Ivan J. Nelson 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 for enhancing the response of a biometric sensor
    Patent number: 5624848
    Abstract: The present invention provides an apparatus and method for enhancing the response of a biometric sensor for sensing toxins by measuring the rate of change of sensor readings. An LED, optically coupled to the sensor and a photodiode, transmits light through the sensor to the photodiode. The photocurrent from the photodiode is converted to a digital sensor reading value proportional to the darkness of the sensor and is loaded into a microprocessor. In the microprocessor, the sensor readings are essentially differentiated to determine the rate of change of the sensor readings. The rate of change information is used to trigger an alarm condition indicative of a predetermined level of sensed toxins.
    Type: Grant
    Filed: May 1, 1996
    Date of Patent: April 29, 1997
    Assignee: Quantum Group, Inc.
    Inventors: Glenn Marnie, Earl M. Dolnick, Ivan J. Nelson
  • Method for enhancing the response of a biomimetic sensor
    Patent number: 5573953
    Abstract: The present invention provides an apparatus and method for enhancing the response of a biometric sensor for sensing toxins by measuring the rate of change of sensor readings. An LED, optically coupled to the sensor and a photodiode, transmits light through the sensor to the photodiode. The photocurrent from the photodiode is converted to a digital sensor reading value proportional to the darkness of the sensor and is loaded into a microprocessor. In the microprocessor, the sensor readings are essentially differentiated to determine the rate of change of the sensor readings. The rate of change information is used to trigger an alarm condition indicative of a predetermined level of sensed toxins.
    Type: Grant
    Filed: September 9, 1994
    Date of Patent: November 12, 1996
    Assignee: Quantum Group, Inc.
    Inventors: Glenn Marnie, Earl M. Dolnick, Ivan J. Nelson