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President Rutherford B. Hayes ; Said in 1876, after Alexander Graham Bell demonstrated the telephone to him at the White House
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| Number | Title | Issue Date |
| 7179432 | Corona generator structure An improved corona generator structure includes a ground tube body sheathed within an insulating sleeve. One end of the ground tube body is provided with a sealing lid for being firmly coupled to the end portion of the ground tube body. At least one piece of high vo... | 02/20/2007 |
| 6768264 | Short arc lamp with improved thermal transfer characteristics A short arc lamp is optimized for improved thermal performance characteristics. The short arc lamp includes a ceramic body having a concave reflective surface formed in an upper end thereof, a base adapted to receive the base end of the ceramic body in abutting rela... | 07/27/2004 |
| 5721465 | Xenon arc lamp with improved reflector cooling A xenon arc lamp comprises a cylindrical ceramic body in which an elliptical reflector is molded to have a diameter of about 1.4 inches. The ends each have metal electrical contact rings, one for the anode and one for the cathode. The body has two differe... | 02/24/1998 |
| 5502346 | Apparatus to generate corona discharges An apparatus to generate corona discharges that consists of (a) a ground electrode tube, (b) a single-opening insulating tube inserted into the ground electrode tube, (c) a high-voltage electrode tube inserted into the insulating tube, and (d) two insulat... | 03/26/1996 |
| 5399931 | Two kilowatt short arc lamp having a metal heat-transfer pad An embodiment of the present invention is a short arc lamp comprising an alumina ceramic cylindrically shaped body with a concave opening at one end that is silvered to form a reflector, a cathode suspended within the concave opening in opposition to an a... | 03/21/1995 |
| 4724352 | Short-arc lamp with alternating current drive A short-arc lamp of the type having an internally integral reflector including electrodes mounted to extend along a central axis of symmetry of the lamp and having distal ends of similar shape which are spaced apart to define a short-arc gap such that the... | 02/09/1988 |
| 4574219 | Lighting unit A lighting unit having a filament serving as a supplementary light source, an improved gas discharge tube serving as a main light source having improved electrodes and an improved ballast circuit operating in cooperation with the improved electrodes is di... | 03/04/1986 |
| 4559466 | Metal vapor segmented discharge tubes Conventional discharge tubes comprise electrodes within a separate containing vessel. The electrodes are joined to an external circuit by electrical conductors which pass through the vessel wall via an insulated side arm. Such a construction has disadvant... | 12/17/1985 |
| 4437039 | Starting arrangement for high-intensity-discharge sodium lamp High-intensity-discharge (HID) sodium lamp has a starting aid comprising a conducting ceramic which is hermetically sealed to and extends through an alumina arc tube at least at one end thereof to form an electrically conducting path. The conducting ceram... | 03/13/1984 |
| 4359662 | Flash discharge lamp A flash discharge lamp in which a tubular glass bulb is sealed at both ends by a cathode metal cap and an anode metal cap, respectively; a cathode material member is mounted on the top of an intermediate member planted on the bottom of the cathode metal c... | 11/16/1982 |
| 4318024 | Flash tube A flash tube is disclosed having metallic end caps attached either in the shape of a plate or a cup upon ends of a glass or quartz tube. They are attached by adhesive, or are soldered on by soldering glass. One of the end caps internally supports a sinter... | 03/02/1982 |
| 4107566 | Rugged quick-heating electron tubes 1. A rugged combustion-heated electron tube comprising: a metallic conica-shaped anode structure; a metallic conically-shaped cathode structure insulatedly and coaxially mounted in spaced relationship to said anode structure; a metallic conically-shaped ... | 08/15/1978 |
| 4099084 | Impulse discharge lamp with disc shaped electrodes An impulse discharge lamp comprising a gas-filled hollow-cylindrical discharge receptacle, whose ends are sealed, vacuum tight, by respective electrodes, which are of disc- or cup-shaped configuration, and have an external diameter which is slightly less ... | 07/04/1978 |
| 4092560 | Vapor discharge lamp cermet electrode-closure and method of making A cermet seal for high pressure gas discharge lamps which also serves as an electrode, is made from a metallic component suitable for use as an electrode, and a ceramic component which is a metal oxide, by mixing the ingredients in a powdered form, then m... | 05/30/1978 |
