
US Patent No: 5,576,581
Number of patents in Portfolio can not be more than 2000
Door control system and release mechanism
Stats
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Nov 19, 1996
Issued date -
Nov 17, 1993
filing date -
08/153,590
serial no -
In Force
status
Importance
Abstract
Fire control systems and release mechanisms. The release mechanisms of the present invention comprise a digital logic circuit for processing signals which are indicative of a condition in an outside environment, and for providing a trigger that will actuate the mechanical release mechanism in response to the condition, a power circuit for providing regulated power to the electronic circuit in response to the input power, the regulated power being used to operate the digital logic circuit, and a power backup circuit interfaced to the power circuit for providing the regulated power for a predetermined time in the event of an input power failure so that the digital logic circuit can be operated for the predetermined time during the input power failure.
First Claim
Related Publications
International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 4,386,645 Side folding closure | 27 | 1981 | |
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| 5,278,454 Emergency capacitive energy source and circuit for damper motors and actuator motors | 22 | 1992 | |
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| 5,082,316 Release mechanism and method with alarm circuit | 70 | 1990 | |
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| 5,272,385 Photographic and X-ray film protection system | 1 | 1990 | |