Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2006-10-04
2009-11-17
Le, Que T (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S576000, C250S216000
Reexamination Certificate
active
07619235
ABSTRACT:
An infra-red liquid sampling cell has a sapphire base plate with a part-spherical concave recess. A sapphire upper plate is hinged relative to the base plate larger radius of curvature than the recess. When the upper plate is lowered into contact with the base plate its convex surface contacts the liquid sample thereby excluding air bubbles and, when in contact with the edge of the recess, produces a well-defined sample thickness. An infra-red source directs radiation down through both plates and the liquid sample to a detector.
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patent: 4003661 (1977-01-01), Yamano
patent: 4980551 (1990-12-01), Wong
patent: 5923031 (1999-07-01), Naya
patent: 6531702 (2003-03-01), Mischler et al.
patent: 2003/0180191 (2003-09-01), Suzuki et al.
patent: 0 436 338 (1991-07-01), None
patent: 55116243 (1980-09-01), None
Infrared Window Materials, http://infrared.als.lbl.gov/IRwindows.html.
Gunning Mark Julian
Poulter Graham
Bennett Jennifer
Foley & Lardner LLP
Le Que T
Smiths Group PLC
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