Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition – Responsive to liquid level
Reexamination Certificate
2005-05-13
2008-08-26
Gordon, Brian R. (Department: 1797)
Chemical apparatus and process disinfecting, deodorizing, preser
Control element responsive to a sensed operating condition
Responsive to liquid level
C422S105000, C422S105000, C422S107000, C422S108000, C073S863320, C073S864000, C073S864010, C073S864020, C073S864240, C073S427000, C222S198000, C222S230000
Reexamination Certificate
active
07416706
ABSTRACT:
A level sensor apparatus is disclosed for detecting contact of a pipetting needle with a liquid contained in a vessel. The apparatus includes a sensor head made up of a pipetting needle, a needle holder, and an electromechanical transducer. The sensor head also has an associated mechanical resonance frequency. An electrical signal generator is used to generate a driving signal which when applied to the electromechanical transducer causes vibration of the pipetting needle at the resonance frequency. A measurement device is used to measure a parameter of a vibration signal indicative of the mechanical vibration of the pipetting needle when it is driven by the driving signal. An electronic circuit and associated computer software is provided to evaluate variation of the vibration signal with time and thus detect contact of the pipetting needle with a liquid contained in the vessel.
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European Search Report for EP 04 07 6435.9 dated Mar. 12, 2004.
Dual, Jürg, “Micro- and Nanomechanics,” IMES, Seite 1 von 24, http://www.zfm.ethz.ch/e/res/mic/ printed Jul. 27, 2004.
Dual, Jürg, “Mirco- and Nanomechanics,” IMES, Seite 1 von 24, http://www.zfm.ethz.ch/e/res/mic/ printed Jul. 27, 2004, published Sep. 16, 2002.
Brunner Markus
Dual Jürg
Elsenhans Olivier
May Frank
Siljegovic Vuk
Gordon Brian R.
McDonnell Boehnen & Hulbert & Berghoff LLP
Roche Diagnostics Operations Inc.
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