Patents by Inventor Harry E. Watkins

Harry E. Watkins 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).

  • EAS system loop antenna having three loops of different area
    Patent number: 5404147
    Abstract: An EAS system in which a transmitter alternately drives first and second antennas with the same coded message signal in its entirety. The antennas, in turn, transmit first and second signals each containing the coded message signal into respective first and second partially overlapping parts of an interrogation zone. Also disclosed is an antenna structure comprised of a plurality of loops extending one after the other and successive ones of which are of opposite phase. One of the loops circumscribes an area which is smaller than each of the other loops to realize reduced coupling to adjacent structures.
    Type: Grant
    Filed: October 28, 1992
    Date of Patent: April 4, 1995
    Assignee: Sensormatic Electronics Corporation
    Inventors: Frank Drucker, Sylvie R. Morin, Harry E. Watkins
  • EAS system with alternating on/off transmitter operation and loop antenna
    Patent number: 5327118
    Abstract: In an EAS system a transmitter alternately drives first and second antennas with the same coded message signal in its entirety. The antennas, in turn, transmit first and second signals each containing the coded message signal into respective first and second partially overlapping parts of an interrogation zone. Also disclosed is an antenna structure comprised of a plurality of loops extending one after the other and successive ones of which are of opposite phase. One of the loops circumscribes an area which is smaller than each of the other loops to realize reduced coupling to adjacent structures.
    Type: Grant
    Filed: September 8, 1993
    Date of Patent: July 5, 1994
    Assignee: Sensormatic Electronics Corporation
    Inventors: Frank Drucker, Sylvie R. Morin, Harry E. Watkins
  • Method and apparatus for determining the magnitude of a field in the presence of an interfering field in an EAS system
    Patent number: 5189397
    Abstract: A method and apparatus for determining the amplitude of a first magnetic field at a first fundamental frequency in a zone in which a second magnetic field is able to be present wherein first and second transmissions of a magnetic field at the fundamental frequency and different phases is carried out at different times, the field in the zone is detected for each transmission and the detected fields are processed to determine the magnitude of the first magnetic field.
    Type: Grant
    Filed: January 9, 1992
    Date of Patent: February 23, 1993
    Assignee: Sensormatic Electronics Corporation
    Inventors: Harry E. Watkins, David L. Roberson
  • Electronic article surveillance system
    Patent number: 5103234
    Abstract: A magnetic article surveillance system utilizing microcomputer control and unique time domain and frequency domain information gathering channels whose information is processed by the microcomputer via preselected time domain and frequency domain criteria.
    Type: Grant
    Filed: February 20, 1991
    Date of Patent: April 7, 1992
    Assignee: Sensormatic Electronics Corporation
    Inventors: Harry E. Watkins, Brent F. Balch, Jeffrey T. Oakes, Richard L. Copeland, Hubert A. Patterson, Mart Martinson
  • Multi-mode electronic article surveillance system
    Patent number: 5049857
    Abstract: A magnetic article surveillance system in which surveillance is carried out by operating the system in first and second different modes of a magnetic transmitting and receiver means in order to make a determination as to the presence of an article in the zone.
    Type: Grant
    Filed: July 24, 1989
    Date of Patent: September 17, 1991
    Assignee: Sensormatic Electronics Corporation
    Inventors: Christopher B. Plonsky, Harry E. Watkins, Marco A. Paez
  • Interfering signal rejection circuitry and electronic article surveillance system and method employing same
    Patent number: 4975681
    Abstract: A control arrangement both interrelates the frequency of transmitted signals to an interfering frequency and effects received signal processing also with relation to the interfering frequency in reaching enhanced insensitivity to undesired content of received signals. In particular respect of interference arising in an EAS system in relation to the local power frequency, the invention looks to a control arrangement which both interrelates the frequency of the transmitted signals to the local power frequency and effects received signal processing with relation to the local power frequency in reaching enhanced insensitivity to undesired content of received signals.
    Type: Grant
    Filed: December 7, 1989
    Date of Patent: December 4, 1990
    Assignee: Sensormatic Electronics Corporation
    Inventors: Harry E. Watkins, Kevin Lynch
  • Electronic article surveillance system employing time domain and/or frequency domain analysis and computerized operation
    Patent number: 4859991
    Abstract: A magnetic article surveillance system utilizing microcomputer control and unique time domain and frequency domain information gathering channels whose information is processed by the microcomputer via preselected time domain and frequency domain criteria.
    Type: Grant
    Filed: August 28, 1987
    Date of Patent: August 22, 1989
    Assignee: Sensormatic Electronics Corporation
    Inventors: Harry E. Watkins, Brent F. Balch, Jeffery T. Oakes, Richard L. Copeland, Hubert A. Patterson, Mart Martinson