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 |
| 6060702 | Low-cost light-weight star tracking telescope Three folded Maksutov/Bouwers telescopes formed in a single housing to provide focused images from three angularly spaced fields of view. The fields of view are positioned 30° from a central axis and are spaced 120° apart in azimuth. Light enters the te... | 05/09/2000 |
| 5799902 | Economical launch vehicle A low-cost, liquid-propellant rocket launch vehicle having a central pod that carries an optional final-stage rocket engine cluster, and having additional engine clusters arranged in diametrically opposed pairs of clusters. The pairs of clusters are burne... | 09/01/1998 |
| 5687084 | Satellite orbit maintenance system A technique for maintaining a satellite in an assigned orbit without control or intervention from the ground. Autonomously obtained navigational data provide a measurement of the actual orbit in which the satellite is traveling. So long as the measured or... | 11/11/1997 |
| 5528502 | Satellite orbit maintenance system A technique for maintaining a satellite in an assigned orbit without control or intervention from the ground. Autonomously obtained navigational data provide a measurement of the actual orbit in which the satellite is traveling. So long as the measured or... | 06/18/1996 |
| 5109346 | Autonomous spacecraft navigation system A method and corresponding apparatus for providing spacecraft attitude, position and orbit data without the need for externally supplied data. Using onboard observations of the earth, sun and moon, the system determines spacecraft attitude, instantaneous ... | 04/28/1992 |