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3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 7470871 | Machine for welding rails of a track A machine for welding rails of a track extending in a longitudinal direction includes a rail pulling device for gripping the rails to be welded to one another. The rail pulling device is connected to a machine frame of the welding machine by way of guides and coupli... | 12/30/2008 |
| 6762390 | Rail welding device A rail welding device arranged for mobility along a track direction for effectuating the electric resistance welding of two track rails, comprising a control unit, and two halves of the device movable in the track direction, each half of the device being aligned wit... | 07/13/2004 |
| 6713707 | Welding material and method without carrier A welding material is constructed and arranged to be positioned in electrically conductive relation between exterior surface portions of first and second weldable members at a location where the first and second weldable members are to be joined. The welding materia... | 03/30/2004 |
| 6031197 | Resistance rail welding device with alignment mechanism A device for welding together elongated work pieces such as railroad track, is provided with controls to eliminate pre-existing angles that exist between each work piece prior to joining.... | 02/29/2000 |
| 5979738 | Machine for flash-butt welding of rails A machine for flash-butt welding of rails, incorporates two tong-type clamping devices made in the form of two two-arm levers carried by a common central axle with insulation from each other and capable of being displaced along the axle relative to each o... | 11/09/1999 |
| 5605283 | Weld joint between two rails arranged behind each other along a rail track Two rail sections are joined by a weld joint (5) between two rails (1,2) arranged one behind another in a lengthwise direction of a rail track (4) and a method for the production of this weld joint (5). The frontal ends (6,7) of the rails (1,2) which are ... | 02/25/1997 |
| 5389760 | Flash butt welding facility A flash butt welding facility exhibits a housing (1) and a slide (2) linearly displaceable in the former. Respectively one clamping system is installed in the housing (1) and in the slide (2), by means of which profiled workpieces, e.g. rails (5a, 5b), ca... | 02/14/1995 |
| 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 |
| 5099097 | Mobile electric flash-butt welding unit A mobile electric flash-butt welding unit for welding together adjacent ends of track rail sections comprises a pair of welding heads displaceable in a longitudinal direction towards each other, each welding head comprising two tong-like parts pivotal tow... | 03/24/1992 |
| 4929816 | Electric flash-butt welding machine and method of providing a welded joint between adjacent ends of rail sections A mobile electric flash-butt welding machine comprises machine frame, undercarriages supporting the machine frame on a railroad track, and a drive for propelling the machine frame along the track. The machine frame carries a hydraulic fluid supply pump, a... | 05/29/1990 |
| 4686341 | Gas shield chamber for arc welding of rails A gas shield chamber for enclosing a welding joint of a pair of rails during the arc welding of the welding joint. A pair of side backing plates are each held in contact with the groove at one side of the rails within the chamber and the side backing plat... | 08/11/1987 |
| 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 |
| 4645898 | Powder welding of two members Method and apparatus for joining two elongated members, such as rails, together by holding the rail ends in fixed relationship respective to one another while ramming powder metal between the confronting ends of the rails. Current flow occurs across the c... | 02/24/1987 |
| 4641818 | Apparatus for adjusting two butt-ends of rails to be connected by welding Apparatus for adjusting two butt-ends of rails to be connected by welding comprises a rigid structure having two aligned support plates one for each rail. Each support plate comprises a non-adjustable retaining press and an adjustable retaining press. The... | 02/10/1987 |
| 4414454 | Method of welding continuous rails and apparatus therefor A method and apparatus for forming a continuous railroad track including a mobile welding plant which is comprised of, for example, a string of flat cars for transporting a number of already formed continuous rails, another flat car or the like carrying m... | 11/08/1983 |
| 4413169 | Electro-slag welding process for irregular sections An electro-slag welding method and apparatus has been developed for butt-joint welding of steel rails or other metallic pieces having irregular cross section, in which the head and the web of the rail is surrounded with a conventional water cooled copper ... | 11/01/1983 |
| 4410780 | Machines for welding rails or similar articles A machine for flash welding rails having two gripping clamps with conductive jaws pivoted on a common shaft, at least one clamp being able to slide along said shaft relative to the second clamp under the action of a jack and being guided along rods dispos... | 10/18/1983 |
| 4320708 | Devices for adjusting two butt ends of rails to be connected by welding A device for adjusting two butt ends of rails to be connected by welding comprises a rigid structure which is formed by two support plates. The support plates are aligned and interconnected by a concave part and which is able to be disposed horizontally s... | 03/23/1982 |
| 4313382 | Setting arrangement for alignment and gap between two rail ends An improved apparatus for aligning and setting the gap between two rail ends comprises a rigid housing overlapping the two rails and providing an access area around the two rail ends. A first pair of presses and a second pair of presses are mounted in lin... | 02/02/1982 |
| 4272664 | Mobile rail welding machine A mobile rail welding machine comprises a frame, two undercarriages supporting the frame, a hydraulically driven flash butt welding unit for welding abutting rail section ends of a track rail mounted on the frame intermediate the undercarriages, a hydraul... | 06/09/1981 |
| 4270036 | Device for welding together two bars on their front sides A welding apparatus including, generally, a vertical clamping assembly having an upper and a lower clamping assembly for each of two rail sections to be welded together. These vertical clamping assemblies clamp and vertically align the running surfaces of... | 05/26/1981 |
| 4236453 | Mobile rail welding machine A mobile rail welding machine comprises a frame, a hydraulically driven flash butt welding device, a "Thermit" welding unit and preferably an electric arc welding device mounted on the frame for selectively flash butt welding, "Thermit" welding or arc wel... | 12/02/1980 |
| 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 |
