Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 6910932 | Solid mercury releasing material and method of dosing mercury into discharge lamps A solid mercury-releasing material and a method of dispensing precise amounts of mercury into the light emitting chamber of a discharge lamp without introducing the other dispenser components into the chamber are disclosed. The solid material includes an amalgam of ... | 06/28/2005 |
| 5342233 | Methods for removing contaminants from arc discharge lamps A method for removing contaminants from an arc tube includes introducing an inert gas into the arc tube through a conduit extending through the lamp tubulation and exhausting the gas through the space between the conduit and the wall of the lamp tubulatio... | 08/30/1994 |
| 5114372 | Method of producing a gas discharge light source A method for producing a gas discharge light source for emitting an electromagnetic radiation comprising a gas discharge tube filled with at least one discharge gas material and having a means for generating a gas discharge includes the following method s... | 05/19/1992 |
| 4823050 | Metal-halide arc tube and lamp having improved uniformity of azimuthal luminous intensity A metal-halide arc tube and lamp having improved uniformity of azimuthal luminous intensity and being particularly suited for navigational signal applications. The arc tube when operationally positioned about a vertical axis has a body which is substantia... | 04/18/1989 |
| 4720652 | Sealed beam headlamp and method for testing its serviceability A sealed beam lamp having an outer envelope defining a gas-tight enclosure filled with an inert nonreactive gas at a pressure in the range of 5 to 50 Torrs, and an illuminating burner capsule mounted within the enclosure. The integrity of the gas-tight en... | 01/19/1988 |
| 4539508 | Method of producing a low-pressure mercury vapor discharge lamp A method of producing a low-pressure mercury vapor discharge lamp which includes positioning a container in the lamp vessel of the lamp between the electrodes. The container holds a quantity of mercury required for operation of the lamp and is attached to... | 09/03/1985 |
| 4449948 | Method of introducing sodium amalgam into lamps and lamp containing sodium amalgam particles Substantially pure, free flowing, sodium amalgam particles of predetermined composition and controlled particle size are prepared for use as vaporizable fill for high pressure discharge lamp devices, whereby accurately measurable quantities of the sodium ... | 05/22/1984 |
| 4427919 | Mercury holder for electric discharge lamps A mercury holder for electric discharge lamps, such as tubular fluorescent lamps, is mounted within the lamp envelope so as to serve as a target for bombardment by electrons and ions. The source of the bombardment may be the electrons emitted by one of th... | 01/24/1984 |
| 4190511 | Method of manufacturing an internal mirror type gas laser tube A metallic member is disposed in the vicinity of a mirror within an internal mirror type gas laser tube, and an electric discharge is excited between an internal laser anode and the metallic member. The metallic member serves as a cathode to sputter the m... | 02/26/1980 |
| 4145101 | Method for manufacturing gas insulated electrical apparatus A method of manufacturing gas insulated electrical apparatus wherein a charging portion of an electrical apparatus is disposed in a sealed chamber filled with an insulation gas, with the charging portion being insulated from the chamber, and conductive pa... | 03/20/1979 |
