The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 31, 1976
Filed:
Sep. 22, 1975
Theodore Simon, Plainview, NY (US);
Other;
Abstract
An improved alarm system is disclosed which includes one or more remote stations. Each remote station is connected to the central or control station by only three conductors or leads. The control and remote stations each include a pair of back-to-back LED diodes, the diodes of each pair emitting a different color light when current flows therethrough. The control and remote stations each also includes a key switch which is operative to 'enable' and 'disable' the alarm circuitry at the control station. By controlling the direction as well as the wave shape of the currents passing through the LED diodes, four different visual signals may be provided at the control and remote stations to indicate the status of the alarm system. Actuation of any of the key switches reverses the current through the LED diodes so that the different colors are indicated when the alarm system is 'enabled' or 'disabled'. Pulsing means is provided at the control station for producing either a constant current through the LED diodes when an alarm condition does not exist, and a pulsed current when an alarm condition is generated. The current in each direction can be pulsed through the LED diodes so that each pair of back-to-back diodes can emit four distinguishable visible signals indicative of different conditions of the alarm system. A fifth indication may be provided by essentially the same circuitry when a parallel delay loop is provided in addition to the main loop to indicate the condition of the delay loop.