Resources Contact Us Home
Electrical alarm system for installation in a window casing

Image Number 2 for United States Patent #4553134.

An electrical system is provided for attachment to basement windows or the like for the purpose of sounding an alarm automatically if the window is opened and the device is moved or tampered with. The system comprises a spring-loaded bar or a tube within a tube which is placed in the window frame without the need for screws, adhesive or other fastening means. When installed and spring-loaded, the assembly holds an electric switch in place against the side wall of the window. If the assembly is jarred or moved the switch is released, the electrical connection is either made or broken and an alarm is sounded.

  Recently Added Patents
Lubricating oil compositions
Non-phosphorus-based gellant for hydrocarbon fluids
Intraoral camera for dental chairs
Additives for oil recovery from reservoirs
Method for producing purified influenza virus antigen
System and method for selecting a video encoding format based on feedback data
Coordinate measuring device and method for measuring with a coordinate measuring device
  Randomly Featured Patents
Motor fuel delivery unit
Method of removing a charge from an electrophotographic photoreceptor
Node, correspondent node, mobility anchor point, and home agent in packet communication system, packet communication system, and path MTU discovery method
Predictive internet automatic work distributor (Pre-IAWD) and proactive internet automatic work distributor (Pro-IAWD)
Apparatus for improving the quality of a large amount of water and the quantity of dissolved oxygen therein
Optical transceiver PCB mounting system having EMI containment features
Multiple detector decision receiver
Method and apparatus for correcting drift in the level of a video signal in a telecine
Bridge inspection diagnostic system
Semicondutor isolation structure