US Patent No: 5,444,434

Number of patents in Portfolio can not be more than 2000

Extended life smoke detector

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Abstract

The present invention is an improvement in battery powered smoke detectors. A smoke detector is powered by a series connection of two Li/SOCl.sub.2 cells having a capacity of about 2 amp hours. The smoke detector draws a quiescent current of about 7 .mu.A. A low voltage alarm activates when the battery voltage falls below about 6.0 volts upon the periodic application of about a 250 .mu.A to about a 1 mA battery test pulse. The cells are soldered directly into the smoke detector PC board and the smoke detector is placed in an unopenable case to deter battery removal. Smoke detector life expectancy including the battery is 15 years. This invention was made with Government support under grant number SOH (AHR-B) 1 R43 CE00014-01 awarded by the Centers for Disease Control (CDC), Center for Environmental Health and Injury Control (CEHIC), Division of Injury Control. The Government has certain rights in this invention.

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First Claim

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Patent Owner(s)

  • Assignment data not available. Check USPTO

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Serby, Victor M 255 Hewlett Neck Rd., Woodmere, NY 11232 3 41

Cited Art

Patent Info (Count) # Cites Year
 
POWER CONVERSION, INC. (1)
4,231,026 Battery discharge level detection circuit 19 1978
 
Other [Check patent profile for assignment information] (1)
5,115,223 Personnel location monitoring system and method 111 1990

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
WALTER KIDDE PORTABLE EQUIPMENT, INC. (8)
6,160,487 Single lockout mechanism for a multiple battery compartment that is particularly suited for smoke and carbon monoxide detector apparatus 11 1999
7,492,273 Pivoting battery carrier and a life safety device incorporating the same 0 2004
7,123,158 Life safety alarm with a sealed battery power supply 3 2004
7,508,314 Low battery warning silencing in life safety devices 0 2005
7,385,517 Gateway device to interconnect system including life safety devices 3 2005
7,339,468 Radio frequency communications scheme in life safety devices 2 2005
7,525,445 Life safety alarm with a sealed battery power supply 0 2006
7,948,389 Pivoting battery carrier and a life safety device incorporating the same 0 2008
 
MAPLE CHASE COMPANY (2)
5,969,600 Dangerous condition warning device incorporating a time-limited hush mode of operation to defeat an audible low battery warning signal 26 1998
6,433,700 Multiuse on/off switch for hazard detector 10 2001
 
BRK BRANDS, INC. (1)
5,990,797 Ultraloud smoke detector 7 1997
 
FIRST NATIONAL BANK OF CHICAGO, THE (1)
5,578,996 Long life detector 9 1994
 
Other [Check patent profile for assignment information] (1)
5,574,436 Smoke detector including an indicator for indicating a missing primary power source which is powered by a substantially nonremovable secondary power source 21 1993