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
Eye therapy system
Gangable electrical box and leveling assembly
Disk drive
Apparatus and method for controlling a tunable matching network in a wireless network
Partial response decision feedback equalizer with distributed control
EpCAM as a reprogramming factor for non-pluripotent cells
Image forming apparatus and image forming method
  Randomly Featured Patents
Abrasion resistant braided sleeve
EEPROM cell structure and architecture with increased capacitance and with programming and erase terminals shared between several cells
Fabricating bodies
Electrical wire connector
Gas compressor
Portable electronic device and its secret information collation method
Apparatus and method for thermomechanically forming an aluminide part of a workpiece
Probing card and inspection apparatus for microstructure
Semiconductor light-emitting element for flip-chip mounting
Circumferential ablation device assembly and methods of use and manufacture providing an ablative circumferential band along an expandable member