U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Penn Jillette of Penn and Teller fame has patented a "Hydro-Therapeutic Stimulator", which uses a hot tub for stimulation.

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Class 258/10 - LONGITUDINALLY EXTENDING AUXILIARY TRACK

Subclass of Class 258 - Railway mail delivery
Definition: Means comprising an auxiliary receiving or supporting track
No. of patents: 0