Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 7197933 | Ultrasonic sensor for controlling the process during resistance spot welding A sensor carrier is provided that has at least one oscillating element (32) that introduces ultrasonic waves into an area to be examined and/or receives ultrasonic waves coming from the area to be examined, whereby the oscillating element (32) is locat... | 04/03/2007 |
| 6852940 | Welding device A welding device for welding together two rails of a track and producing a welded joint is composed of two halves. An air nozzle and a temperature sensor are mounted on one of the halves. Via a cooling opening of the air nozzle, a glowing-cooled hot welded joint can... | 02/08/2005 |
| 6531675 | Laser welding method and apparatus A laser welding method and apparatus includes a laser manipulator that directs a laser beam emitted from a laser generator at various predetermined angles toward predetermined positions within a laser work zone. A transport device passes workpieces throug... | 03/11/2003 |
| 6515249 | Method of railroad rail repair A method of repairing a damaged railroad rail comprising the steps of: identifying a defect in the rail, removing the portion of the rail having a defect and leaving two truncated rail ends, preparing the truncated rail ends for welding, and welding the t... | 02/04/2003 |
| 6294752 | Method of flash-butt welding A method of flash-butt welding in which the travel speed (Vt) of the machine mobile plate and the welding voltage (U2) are changed (by preset programs) and the travel speed is controlled through negative feedback by welding current, ... | 09/25/2001 |
| 6163003 | Method and apparatus for controlling forging force during flash butt welding of railway rails A method and apparatus are provided for flash butt weld joining adjacent rail ends on site during initial field installation where at least one of the rails is fastened to the roadbed, and inclosure butt welding rails as in de-stressing long sections of r... | 12/19/2000 |
| 5763850 | Welding process with upright noncoaxial orbital transverse motion contact with electric resistance heating An improved welding process in which two metallic pieces are each composed of weld compatible parent metal, one metallic piece has one surface and the other metallic piece has another surface each having prominences positioned thereon and an oxide of pare... | 06/09/1998 |
| 5270514 | Method and apparatus for flash butt welding railway rails A welding method and apparatus for flash butt welding adjacent ends of axially aligned railway rails includes a base frame and fixed and movable platens supported on the base frame. The platens support rail sections and are under the control of controller... | 12/14/1993 |
| 5136140 | Rail tensioning apparatus An apparatus for reducing a gap between an end of a rail section and an adjacent end of a longitudinally succeeding rail section of a rail fastened to ties by fastening elements by tensioning or longitudinally extending the rail section comprises two long... | 08/04/1992 |
| 4921568 | Moving head high frequency resistance welding system In a high frequency resistance welding system useable with massive or spatially extensive workpieces, the welding head is transported over weld areas by gantry means to provide high speed, high quality welds at appreciably less cost and with quality compa... | 05/01/1990 |
| 4656328 | Welding fixture A welding fixture by which two elongate members are manipulated in a manner to become butt welded together. Two gripping members in the form of groups of spaced slip assemblies are enclosed in mounted relationship within a housing. The slips of each group... | 04/07/1987 |
| 4645897 | Method and apparatus for aligning two work pieces for welding and for weld upset removal A rail alignment device and a shear head are suspended from a trolley running over a rail welding machine. The alignment device comprises structure forming a downwardly-opening bight and carrying locating stops, clamping cylinders and transducers with sen... | 02/24/1987 |
| 4215260 | Apparatus for welding two profile or section rods by means of resistance welding, especially for welding two rails An apparatus for welding two profile or section rods by means of electrical resistance welding, especially an apparatus for welding two rails. There is provided for each of the profile or section rods a clamping device having contact electrodes for infeed... | 07/29/1980 |
