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 |
| 7731097 | Liquid conservation device and a liquid apparatus incorporating the liquid conservation device A water saving device for us in a hot water system to recover an initial volume of cold water when a hot water tap is turned on. The device has an inlet for receiving water piped from a water heater, a primary outlet for delivering hot water to a tap, and a by-pass ... | 06/08/2010 |
| 7163157 | Automatic compensating valve for individual shower and tub/shower combination fixtures An automatic compensating valve, e.g., for individual shower and tub/shower combination fixtures, has a valve body defining cold and hot water inlet flow passageways, a mixing chamber, a mixed temperate water outlet flow passageway, and an axial bore. The valve incl... | 01/16/2007 |
| 6854658 | Valve system for servo control of fluid flows The present invention provides a mixing valve (30) suitable for electric motor (38) actuation, particularly stepper motor actuation. It also provides a servo mixing valve system, which includes stepper motors for actuation and optionally includes a sol... | 02/15/2005 |
| 6726110 | Thermostatically controlled mixing valve A thermostatic mixing valve contains a control bush, which can be displaced by an expansion element, which is exposed to the mixing water temperature. As a function of the mixing water temperature and the set desired temperature, the control bush is displaced for si... | 04/27/2004 |
| 5215065 | Diesel vehicle fuel heater system A heater valve for a diesel fuel system for a vehicle having a main body portion with a fuel inlet and a fuel outlet adapted to be coupled to the vehicle fuel system. A fuel inlet line and a fuel outlet line from the valve are adapted to be coupled to a h... | 06/01/1993 |
| 5156135 | Diesel fuel heater A heater valve for a diesel fuel system for a vehicle having a main body portion with a fuel inlet and a fuel outlet adapted to be coupled to the vehicle fuel system. A fuel inlet line and a fuel outlet line from the valve are adapted to be coupled to a h... | 10/20/1992 |
| 3954222 | Water mixer A water mixer with a hot and a cold water inlet and one outlet, comprising a longitudinal housing with a longitudinal control reed swingable to throttle one inlet and widen the other one at the same time and vice versa.... | 05/04/1976 |