Communications: directive radio wave systems and devices (e.g. – Determining distance – Material level within container
Reexamination Certificate
2006-09-26
2006-09-26
Sotomayor, John B. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Determining distance
Material level within container
C342S042000
Reexamination Certificate
active
07113125
ABSTRACT:
A level of liquid of pulverent solids in a container (or volume of a liquid in the absence of gravity) is detected by using radio frequency identification (RFID) tags or similar transponders located inside or outside the container. The interrogation signal and/or the return signal is attenuated by the material and the signal strength of the return signal, if any, is evaluated either directed or in a binary fashion by imposing a threshold to determine whether or not material in contained in a portion of the container corresponding to the location of a particular RFID tag or transponder. Volume, pressure and container orientation can also be derived in accordance with one or more return signals.
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“New Technology Upgrades RF Level Sensing”; Automation and Control, vol. 17, No. 9; Oct. 1986; p. 13-14.
International Business Machines - Corporation
Pivichny John R.
Sotomayor John B.
Whitham Curtis Christofferson & Cook PC
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