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In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.
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| Number | Title | Issue Date |
| 5418984 | Hydrotherapy seat structure for a hydrotherapy spa, tub or swimming pool A hydrotherapy spa includes an upwardly open, U-shaped, cross-sectional, waterproof spa shell defining a receptacle for holding water. The spa shell includes a horizontal seat portion and an integral seat back extending generally vertically upwardly there... | 05/30/1995 |
| 5345621 | Method of insulating a spa using a flexible insulation blanket A portable type spa is insulated by a sequence of steps involving initially the preparation of an insulation blanket having a metal foil heat reflective surface on one side with orthogonal dimensions of the blanket sized larger than the orthogonal dimensi... | 09/13/1994 |
