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Penn Jillette of Penn and Teller fame has patented a "Hydro-Therapeutic Stimulator", which uses a hot tub for stimulation.
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| Number | Title | Issue Date |
| 7459971 | Amplifier circuit The present invention provides an amplifier circuit comprising a differential amplifier and a negative feedback loop circuit, in which a positive feedback loop circuit having a gain smaller than a gain of the negative feedback loop circuit is formed inside the negat... | 12/02/2008 |
| 5604461 | Transformerless output vacuum tube audio amplifier An audio amplifier including a series connected vacuum tube output stage for driving an audio loudspeaker. The preferred amplifier uses the output signal as a floating reference for an intermediate stage to prevent output stage degeneration for producing ... | 02/18/1997 |
| 4004241 | Hybrid feedback amplifier of a push-pull type A feedback amplifier including a first and a second amplifier section comprises an autotransformer winding connected between common terminals of the respective amplifier sections and across a feedback circuit. A terminating impedance is connected between ... | 01/18/1977 |
