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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 |
| 7295900 | Load drive apparatus with short circuit determination The load drive apparatus has a driver unit and a control unit. The driver unit includes a control section modulating, in accordance with a PWM signal supplied from the control unit, a drive signal to be applied to a load apparatus between a high level and a low leve... | 11/13/2007 |
| 6031352 | Active alternator load circuit A control apparatus controlling the operation of pulse width modulator for an electric clutch or electric motor in portable spray painting equipment having a pressure transducer for sensing the pressure, a manually adjustable pressure reference, a compara... | 02/29/2000 |
| 4642548 | Control apparatus for charging generator A control apparatus incorporated in a charging generator for controlling interruption of an exciting current supplied to a field winding of the charging generator comprises a power transistor for intermittently interrupting the exciting current, a voltage... | 02/10/1987 |
| 4639657 | Electrical control apparatus and methods Apparatus for use in an electrical power generating system including a generator for supplying an A.C. output voltage to a load on a set of lines and a circuit responsive to the A.C. output voltage for producing a regulating voltage, the generator having ... | 01/27/1987 |
| 4455525 | Control unit for generator driven by engine A control unit is disclosed for controlling the driving torque of a generator driven by an engine in accordance with the number of cylinders to be operated, thereby to achieve stabilized operation. A voltage regulator is provided for varying the field cur... | 06/19/1984 |
