Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2008-05-19
2010-11-23
Pham, Toan N (Department: 2612)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S691100, C340S287000
Reexamination Certificate
active
07839281
ABSTRACT:
Indicator devices and systems for explosion proof enclosures are described. The indicator devices include a sleeve, a dome-like transparent member, a connector body, a first and second contact, a means for preventing the first contact from contacting the second contact, and an indicator. Upon an increase in a temperature or a pressure near the means for preventing (for example, within the enclosure), the means for preventing allows the first and second contacts to contact, thereby completing an electrical circuit from a power source to the indicator (such as a light or an alarm). The indicator systems include an indicator device coupled to an explosion proof enclosure containing critical equipment.
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Cooper Technologies Company
King & Spalding LLP
Pham Toan N
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