Patents by Inventor Thomas E. Berk

Thomas E. Berk 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).

  • Perimeter monitoring system
    Patent number: 6822566
    Abstract: A perimeter monitoring system is arranged to detect passage across a perimeter of an area. The system primarily includes an emitter, a retroreflector, a detector and an alarm. The emitter provides a modulated visible laser beam. The retroreflector is arranged to direct the beam along a segment of the perimeter and return the beam along the segment. The detector includes a device that blocks reception of light outside an angle of less than 5 degrees. One or more local or remote alarms are activated in response to the signal. For example, a remote alarm is located on the inside of a residence window where it is activated by another visible laser beam. Alignment of the peripheral monitoring system is less costly and false alarms are less likely than with known systems.
    Type: Grant
    Filed: April 10, 2001
    Date of Patent: November 23, 2004
    Assignee: On-Guard Pool Products, LLC
    Inventors: Lester R. Matthews, Thomas E. Berk, M. Shaun Farrier
  • Perimeter monitoring system
    Publication number: 20030189487
    Abstract: A perimeter monitoring system is arranged to detect passage across a perimeter of an area. The system primarily includes an emitter, a retroreflector, a detector and an alarm. The emitter provides a modulated visible laser beam. The retroreflector is arranged to direct the beam along a segment of the perimeter and return the beam along the segment. The detector includes a device that blocks reception of light outside an angle of less than 5 degrees. One or more local or remote alarms are activated in response to the signal. For example, a remote alarm is located on the inside of a residence window where it is activated by another visible laser beam. Alignment of the peripheral monitoring system is less costly and false alarms are less likely than with known systems.
    Type: Application
    Filed: April 10, 2001
    Publication date: October 9, 2003
    Inventors: Lester R. Mathews, Thomas E. Berk, M. Shaun Farrier
  • Perimeter monitoring system
    Patent number: 6317043
    Abstract: A perimeter monitoring system is arranged to detect passage across a perimeter of an area. The system primarily includes an emitter, a retroreflector, a detector and an alarm. The emitter provides a modulated visible laser beam. The retroreflector is arranged to direct the beam along a segment of the perimeter and return the beam along the segment. The detector includes a device that blocks reception of light outside an angle of less than 5 degrees. One or more local or remote alarms are activated in response to the signal. For example, a remote alarm is located on the inside of a residence window where it is activated by another visible laser beam. Alignment of the peripheral monitoring system is less costly and false alarms are less likely than with known systems.
    Type: Grant
    Filed: September 1, 1998
    Date of Patent: November 13, 2001
    Assignee: Beamerline, L.L.C.
    Inventor: Thomas E. Berk
  • Perimeter monitoring system
    Patent number: 6288644
    Abstract: A perimeter monitoring system is arranged to detect passage across a perimeter of an area. The system primarily includes an emitter, a retroreflector, a detector and an alarm. The emitter provides a modulated visible laser beam. The retroreflector is arranged to direct the beam along a segment of the perimeter and return the beam along the segment. The detector includes a device that blocks reception of light outside an angle of less than 5 degrees. One or more local or remote alarms are activated in response to the signal. For example, a remote alarm is located on the inside of a residence window where it is activated by another visible laser beam. Alignment of the peripheral monitoring system is less costly and false alarms are less likely than with known systems.
    Type: Grant
    Filed: September 1, 1998
    Date of Patent: September 11, 2001
    Assignee: Caretaker System, Inc.
    Inventors: Lester R. Mathews, Thomas E. Berk, M. Shaun Farrier