Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2005-10-18
2005-10-18
Allen, Stephone B. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S231180, C341S013000
Reexamination Certificate
active
06956199
ABSTRACT:
A movable barrier operator includes an absolute position detector which provides a unique value for each position of the barrier along its path of travel. The absolute position detector employs multiple binary serial streams and one multiple clock stream. After the first five cycles of the clock stream, the binary streams can be decoded by a processor to produce an absolute position. Every clock edge produces a new absolute position along the path of travel.
REFERENCES:
patent: 4628298 (1986-12-01), Hafle et al.
patent: 6376832 (2002-04-01), Smith et al.
patent: 2004/0169133 (2004-09-01), Smith et al.
Fitzgibbon James J.
Rathgeber Martin
Siegler Mark D.
Smith Alan Dane
Valente Christopher M.
Allen Stephone B.
Fitch Even Tabin & Flannery
The Chamberlain Group, Inc.
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