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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 |
| 6525642 | Self-regenerating liquid metal current limiter A self-regenerating liquid metal current limiter including solid metal electrodes for connection to an electric circuit to be protected and several compression chambers which are partially filled with liquid metal. The compression chambers are located one... | 02/25/2003 |
| 5250924 | Power supply testing system for non-utility power generators and so on A power supply testing system for non-utility power generators, etc. includes a test tank filled with a resistive liquid; a main electrode housed within the test tank to receive power from a non-utility power generator to be tested; a movable insulator me... | 10/05/1993 |
| 4493973 | Flow controlled electrode type liquid heater An electrode type liquid heater includes a tank having an inlet and an outlet disposed so that in normal operation of the heater the tank is partially filled with electrically conductive liquid below an electrically nonconductive air space. A plurality of... | 01/15/1985 |
| 4423310 | Electrical steam generator having adjustable electrodes for an air humidifier The steam generator includes a cylindrical tank, a plurality of circumferentially-spaced electrical terminals extending through the tank top wall. To afford the capability of adjusting the horizontal distance between adjacent electrodes while maintaining ... | 12/27/1983 |
| 4394561 | Tank structure for an air humidifying electrode steam generator The electrode steam generator includes a cylindrical water tank including mating top and bottom cylinder halves molded from an electrically insulative synthetic plastic material as substantial mirror images of each other so that both can be molded from di... | 07/19/1983 |
| 4326120 | Temperature control system for an electrode type liquid heater An apparatus for heating an electrically conductive liquid, such as water, includes a rotatable, balanced, buoyant heating assembly floating in a quantity of conductive liquid partially filling a tank. A pair of opposite polarity electrodes are mounted on... | 04/20/1982 |
| 4190762 | Adjustable gap electrode arrangement for electrolytically heated steam iron A lightweight plastic electrolytic steam iron has a soleplate with steam distributing means therefrom and a casing of electrically non-conducting material forming the walls of an internal water tank coextensive with and extending over the soleplate. Space... | 02/26/1980 |
| 4119833 | Electric water heater An electric water heater that includes a metallic housing having a water inlet and outlet, and a non-electrically conducting liner that is impervious to the action of water. First and second carbon electrodes, each in the form of a plate wedge-shaped in c... | 10/10/1978 |
