Monitored transmitter and receiver system and method for...

Communications: electrical – Condition responsive indicating system – Specific condition

Reexamination Certificate

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Details

C340S545200, C340S545300, C340S555000, C049S025000, C049S028000, C318S280000

Reexamination Certificate

active

07123144

ABSTRACT:
An automatic door opening system utilizing wireless links to communicate from hazard or obstruction sensors to a controller to react to such conditions. The present invention allows the use of hazard, fault or obstruction switching devices which themselves utilize internal continuity monitoring in a wireless environment. Compressible hazard switch sensors which utilize internal, continuous conducting elements are continually monitored for breaks in such elements through continuity checks. A signal is generated from the wireless transmitter during door operation to indicate to the system that the link between the wireless transmitter and a wireless receiver is fully functioning at all times. The system can determine if an actual obstruction hazard is detected or if there is a loss of communications between the wireless transmitter and receiver link in the disclosed system while also allowing for wireless continuity checking between sensor switches utilized.

REFERENCES:
patent: 5191268 (1993-03-01), Duhame
patent: 5285136 (1994-02-01), Duhame
patent: 5384495 (1995-01-01), Waggamon et al.
patent: 5412297 (1995-05-01), Clark et al.
patent: 6225768 (2001-05-01), Cookson et al.
patent: 6737821 (2004-05-01), Fitzgibbon et al.
patent: 6737823 (2004-05-01), Reed et al.
patent: 6791461 (2004-09-01), Oku et al.

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