Communications: electrical – Condition responsive indicating system – With particular system function
Reexamination Certificate
2005-01-11
2005-01-11
Hofsass, Jeffery (Department: 2636)
Communications: electrical
Condition responsive indicating system
With particular system function
C340S545400, C340S686100, C340S545100, C318S264000, C318S466000, C042S013000
Reexamination Certificate
active
06842112
ABSTRACT:
Methods and apparatus for sensing barrier position in a barrier movement system are disclosed. Electrical apparatus is connected to the barrier and generates a barrier position signal representative of barrier positions which may be used by a controller to detect barrier position. The electrical apparatus can be manually adjusted to reflect a first barrier position such as a closed position. Other barrier positions can be sensed by comparing the barrier position signal to other manually adjustable position signals.
REFERENCES:
patent: 4408146 (1983-10-01), Beckerman
patent: 4533905 (1985-08-01), Leivenzon et al.
patent: 5218282 (1993-06-01), Duhame
patent: 6288511 (2001-09-01), Porter et al.
patent: RE37784 (2002-07-01), Fitzgibbon et al.
patent: 6605910 (2003-08-01), Mullet et al.
Chen William
Gavel Andrew
Pulis Derek
Fitch Even Tabin & Flannery
Hofsass Jeffery
Lai Anne V.
The Chamberlain Group, Inc.
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