Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 7846276 | Method of making alloys having low coefficient of thermal expansion The present disclosure provides alloys having an ultra-low coefficient of thermal expansion in the range of 60° F. to 80° F. The alloys have coefficient of thermal expansion no greater than 0.35×10−6° F.−1 in the range of 60° F. to 80Â... | 12/07/2010 |
| 7416621 | Laser rounding and flattening of cylindrical parts A method is disclosed for rounding and/or flattening an annular part that is out of round and/or not flat due to non-uniform internal stresses. The part is first checked for out of round and/or out of flat conditions. Out of round parts are then rounded by introduci... | 08/26/2008 |
| 7128332 | Wheelchair designs and related enhancements Wheelchair designs and enhancements are provided for use with conventional wheelchair designs. The designs and enhancements include first and second contoured folding seat panels that are hingedly mounted with respect to the wheelchair frame and that are offer inter... | 10/31/2006 |
| 6956187 | Steel plate splicing facility utilizing shear joining A steel plate splicing facility includes, a steel plate heating apparatus for retrieving and heating a preceding steel plate and a following steel plate, and a shear-joining apparatus for clamping a tail end portion of the preceding steel plate and a leading end por... | 10/18/2005 |
| 6823706 | Steel wire and method of manufacturing the same A steel wire, 0.10-0.40 mm in diameter, obtained by subjecting a high-carbon (0.70-0.90 wt. %) steel wire material to heat treatment and wire drawing, wherein its tensile strength and test values of special repeated torsional tests satisfy a predetermined relation; ... | 11/30/2004 |
| 6432230 | Process and device for hardening a rail Process and device for hardening a rail. The process for hardening a rail or part thereof by transforming it from an austenitic structure into a different microstructure that is stable at room temperature comprises aligning, horizontally positioning, and ... | 08/13/2002 |
| 6328829 | Constrained hardening method and apparatus for deformed bar workpieces Hardening is accomplished by heating a longitudinal section of a workpiece such as an odd-shaped bar, and by quenching while constraining the workpiece section in dies. The quenching is executed while the workpiece is pressed in a direction perpendicular ... | 12/11/2001 |
| 6329081 | Stainless steel sheet material and manufacturing method thereof There is provided a stainless steel sheet material, used for a semiconductor manufacturing device, to which it difficult for fine dust to be attached and from the surface of which the attaching dust can be easily washed away. Also, there is provided a met... | 12/11/2001 |
| 6315845 | Method of straightening sectional steel while simultaneously minimizing the internal stresses thereof A method of straightening rolled sectional steel includes clamping and subsequently cooling at least a sectional steel whose maximum local cross-sectional temperature is below Ar1 and whose minimum local cross-sectional temperature is above a l... | 11/13/2001 |
| 6284064 | Carbon steel material and processing method for strengthening the same In a processing method for strengthening carbon steel materials, a carbon steel having an average hardness in the range of HRC 50 to 57 and a bainite structure is subjected to a tension working so as to provide a residual strain of at least 0.3% to the ca... | 09/04/2001 |
| 6273975 | Method for producing a metal strip and device for reducing the risk of such a strip breaking A method for producing a metal strip which reduces the risk of the strip breaking over the course of a path, the strip being conveyed under stress in the strip direction and in which, in an upstream feed path of the metal strip, defects in the edges of th... | 08/14/2001 |
| 6224694 | Method for heat-treating profiled rolling stock Method for heat-treating profiled rolling stock, including track and railroad rails, having a profiled surface and increased heat removal from portions of the profiled surface during cooling in the gamma range of an iron based alloy material. The method i... | 05/01/2001 |
| 6190470 | Process for manufacturing a honeycomb body from heat-treated two-layered or multi-layered metal foils A process and a device are provided for manufacturing a honeycomb body from at least one metal foil constructed from at least two different layers, in particular from steel roll-bonded with aluminum. The metal foil is at least partly provided with a struc... | 02/20/2001 |
| 6153026 | Method and device for temper-hardening flat metal products The invention discloses a method for temper hardening flat metal products, comprising the following steps: introducing a flat product coming out of the furnace into a temper-hardening bay, depositing this flat product on supporting elements forming a lowe... | 11/28/2000 |
| 6132533 | Method for making arcuate coil springs, resulting springs and devices for carrying out the method The invention relates to a method for making arcuate coil springs from straight coil springs and particularly includes a phase of bending the straight springs during a heat treatment, which method provides exceptional results in that for the bending, a la... | 10/17/2000 |
| 6093268 | Corrective tempering method for rolling elements In a corrective tempering method and apparatus for a rolling element in which the thermal deformation of the rolling element is corrected within an extremely short time by utilizing plasticity exhibited during a metallic structure transforming process bro... | 07/25/2000 |
| 6077369 | Method of straightening wire rods of titanium and titanium alloy A method of straightening a wire rod of titanium or titanium alloy wherein the rod is hot-straightened to a straight rod at the straightening temperature T and elongation &3xb5; satisfying the expression (1) or (2). The method includes hot rolling a titan... | 06/20/2000 |
| 6063216 | Working of a metallic strip This invention relates to the working of a metallic strip. More particularly, the invention relates to a method of working a length of metallic strip by heat treating under tensile force, to a length of metallic strip and to an apparatus for use in workin... | 05/16/2000 |
| 5968293 | Method and apparatus for heat treating and straightening structural members An apparatus (20) for induction heat treating, restraint quenching, and straightening an associated carbon steel truck structural member (30), having a web (32) and at least one flange (34) substantially perpendicular thereto, comprises a heat treating ap... | 10/19/1999 |
| 5885370 | Method of heat treatment of steel Magnetic heat treatment of steel, characterized by transforming steel containing about 0.01 to 2.0 mass % of carbon in a magnetic field having a gradient of about 0.1 T/cm or more and about 10 T/cm or less (absolute value) at the Curie point or lower, to ... | 03/23/1999 |
| 5833778 | Apparatus and method for the manufacture of DR steel strip Apparatus and method for manufacture of DR (Double Rolled) steel strip in which a continuous annealing furnace is arranged for annealing of cold-reduced steel strip passing continuously through said furnace, and a rolling mill for cold-rolling of steel st... | 11/10/1998 |
| 5830290 | Method for the manufacture of a spring band clip The subject invention provides a method for manufacturing a spring band clip, wherein an alloyed steel is shaped, annealed, levelled into a narrow band, then shaped by stamping and bending into a non-machined clip, and the surface of the non-machined clip... | 11/03/1998 |
| 5709759 | Method of working a hot-rolled strip The invention relates to a method of working a hot-rolled stainless steel strip, particularly an austenitic stainless strip, with the intention of reducing the thickness and enhancing the mechanical strength of the strip. The method is characterized by co... | 01/20/1998 |
| 5542995 | Method of making steel strapping and strip and strapping and strip A method of making flat steel strapping or strip from rods, bars or slit steel includes the steps of heating a piece of steel to an elevated temperature greater than the upper critical temperature, hot rolling the steel and quenching the rolled steel from... | 08/06/1996 |
| 5518557 | Process for making railroad car truck wear plates A process for making steel wear plates for use as railroad car truck side frame/bolster damping components utilizes the sequential steps of heating, pressing, quenching and then tempering. The heating process includes bringing the wear plate to a temperat... | 05/21/1996 |
| 5284534 | Thermomechanical methods for improving the fatigue characteristics of metallic materials A thermomechanical method for improving the fatigue characteristics of a metallic material (for example carbon steel and low alloy steel) takes advantage of the materials' plastic flow characteristics to improve external and internal surface conditions. T... | 02/08/1994 |
| 5252152 | Method of controlling warpage in workpiece by selective flame-hardening and vibrations A method for stress-relieving a flame-hardened component by vibrating the workpiece as it is being flame-hardened, and then vibrating the workpiece after it has been flame-hardened, measuring the workpiece to detect warpage, straightening the workpiece to... | 10/12/1993 |
| 5104462 | Scanning induction hardening process by using radially moving induction coil A scanning induction hardening process in which a steel workpiece is surface hardened by progressively traversing its length with an inductor coil energized by an alternating electric current and immediately thereafter quenching the heated portion of the ... | 04/14/1992 |
| 4935071 | Baking of lithographic plates The tendency of lithographic plates to buckle during baking under top heat with the result that the heat treatment is not uniform to minimised by passing the plates through an oven on a conveyor belt which inclines upwardly over part of its path and then ... | 06/19/1990 |
| 4878961 | Method and system for controlling tension to be exerted on metal strip in continuous annealing furnace An annealing operation is performed with controlling tension force to be exerted on a metal strip depending upon thermal crown of hearth rolls. The thermal crown magnitude is assumed based on various factors influencing for the magnitude of the effective ... | 11/07/1989 |
| 4836866 | Method of improving fatigue life of an elongated component The outer surface of an elongated metal component such as a bar is rapidly heated by an induction coil and is thereafter cooled by a quenching spray while being subjected to tensile forces so high that the center portion of the bar approaches yield causin... | 06/06/1989 |
| 4773949 | Process for preventing transverse displacement of metal strip A process for preventing transverse displacement of metal strip comprises correcting a shape of metal strip into flat form prior to the travel of the metal strip into a continuous annealing furnace when continuously annealing the metal strip in the furnac... | 09/27/1988 |
| 4612063 | Method of making a fence stretcher bar A fence stretcher bar manufactured from a continuously fed, hot dip galvanized bar and a method of making such a stretcher bar. In a first manufacturing phase, the bar is formed from a continuously fed round rod which is rolled into a flat bar and coiled ... | 09/16/1986 |
| 4321098 | Continuous hardening of high speed steel A wire of high speed steel is hardened and straightened by a continuous method wherein an annealed high speed steel wire is subjected to steps of austenitizing; quenching; tempering and cooling; and then tempering and cooling under tension. The hardened a... | 03/23/1982 |
| 4099996 | Process for heat-treating the head of railroad rail In the process of heat-treating the head of a railroad rail wherein the rail is stressed so that the head forms a convex arc of predetermined height, the arc height is decreased about 14% after about 10% of the rail head has been heated, and then the orig... | 07/11/1978 |
| 4057989 | Method for levelling a metal strip or sheet A method for levelling a metal strip or sheet in which the metal strip or sheet is subjected to repeated bending by means of a roll arrangement of two or more rolls having a diameter of at least 600 times the thickness of the metal while cooling the metal... | 11/15/1977 |
| 3964938 | Method and apparatus for forming high tensile steel from low and medium carbon steel The specification discloses a completely automated method and apparatus for producing high tensile steel, of a controlled, predetermined U.T.S. and cross sectional area, from low and medium carbon steel by subjecting the steel to substantial elongation wh... | 06/22/1976 |
