Wireless emergency lighting unit

Patent 4682078 Issued on July 21, 1987. Estimated Expiration Date:

January 28, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3688123

3833817

Emergency/normal lighting circuit for a gaseous discharge lamp
Patent #: 4117373
Issued on: 09/26/1978
Inventor: Alley

Emergency lighting fluorescent pack
Patent #: 4144462
Issued on: 03/13/1979
Inventor: Sieron , et al.

Power failure light and circuit therefor
Patent #: 4177500
Issued on: 12/04/1979
Inventor: Nicholl , et al.

Emergency lighting system
Patent #: 4297614
Issued on: 10/27/1981
Inventor: Chandler

Emergency lighting system
Patent #: 4323820
Issued on: 04/06/1982
Inventor: Teich

Emergency lighting system Patent #: 4454452
Issued on: 06/12/1984
Inventor: Feldstein

Inventor

Pascalide, Chiriac

Assignee

Radiant Illumination, Inc.

Application

No. 06/695277 filed on 01/28/1985

US Classes:

315/86, AUTOMATIC SUBSTITUTION OF THE POWER SUPPLY307/64, Substitute or emergency source307/66, Storage battery or accumulator362/183, Rechargeable electrical source of with external connections362/20AUTOMATIC SUBSTITUTION OF POWER SUPPLY OR LIGHT SOURCE

Examiners

Primary: Chatmon, Saxfield Jr.

Attorney, Agent or Firm

Marrs; Roger A.

International Class

H02J 9/06 (20060101)

Abstract

A circuit is disclosed herein for use in series with a fluorescent lamp and a conventional ballast for supplying operating current to the lamp when the main line source of power has been interrupted. The circuit includes a sensor for detecting the lamp current and utilizes the lamp current for charging a storage battery via a battery charger. An inverter ballast circuit is normally maintained in an "OFF" condition by the sensor and is responsive to the sensor when the power source to the lamp has been interrupted so that the power from the battery is applied to the inverter ballast to turn it to the "ON" condition. Conduction of the inverter ballast circuit provides AC voltage to energize the fluorescent lamp through the conventional ballast.