Cleaning and liquid contact with solids – Processes – Including application of electrical radiant or wave energy...
Reexamination Certificate
2008-07-03
2010-11-09
Stinson, Frankie L (Department: 1711)
Cleaning and liquid contact with solids
Processes
Including application of electrical radiant or wave energy...
C134S184000, C134S186000, C134S902000
Reexamination Certificate
active
07828901
ABSTRACT:
An apparatus to produce acoustic cavitation by controlling cavitation events in a liquid insonification medium utilizing a waveform to excite a transducer with a series of bipolar inharmonic tone bursts having medium recovery intervals between respective bursts so that the medium repeatedly recovers from cavitation events between bursts. The apparatus may be used to clean a semiconductor wafer, to de-coat a painted surface having, to induce a chemical reaction, and/or to provide recycled paper made from inked paper de-inked by cavitation. Cavitation events are generated using a transducer and a waveform generator, e.g., square wave tone bursts, to excite the transducer with a signal controlled in frequency, burst repetition rate, duty-cycle and/or amplitude, e.g., utilizing bursts having a frequency between 500 KHz and 10 MHz, and a duty cycle between 0.1% and 70%.
REFERENCES:
patent: 3765771 (1973-10-01), Shaw
patent: 5594165 (1997-01-01), Madanshetty
patent: 6463785 (2002-10-01), Kline-Schoder et al.
patent: 62-261057 (1987-11-01), None
Harbin & Hein PLLC
Stinson Frankie L
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