Famous Patents
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 |
| 7305860 | Method for tube forming A method is provided for forming a tube between a pair of dies. The tube is captured between a pair of dies having die surfaces constructed of an electrically non-conducting material defining a die cavity therein. The ends of the tube are sealed and electrical curre... | 12/11/2007 |
| 7275409 | Method for manufacturing a heat pipe having an enlarged portion A method for manufacturing a heat pipe having an enlarged portion includes the steps of: preparing a hollow tubular material having a uniform outer diameter; forming the tubular material with an enlarged portion having a different or larger outer diameter by narrowi... | 10/02/2007 |
| 7269986 | Method of forming a tubular blank into a structural component and die therefor A method of forming an elongated metal blank into a structural component having a predetermined outer configuration. The method includes providing a shape imparting cavity or shell section formed from a rigid material which includes an inner surface defining the pre... | 09/18/2007 |
| 7062948 | Process of end-forming a tube having internal surface features A process by which the end of a tube having at least one internal surface feature is reduced and at least a portion of the surface feature eliminated from the tube end while achieving accurate control of the outer diameter of the tube end. The process preferably mak... | 06/20/2006 |
| 7024897 | Method of forming a tubular blank into a structural component and die therefor A method of forming an elongated metal blank into a structural component having a predetermined outer configuration. The method includes providing a shape imparting cavity or shell section formed from a rigid material which includes an inner surface defining the pre... | 04/11/2006 |
| 6902651 | Tube bank structure, and flow tube producing method The invention provides tube bank structure and a method of manufacturing a flow tube, which can improve the stabilization of the flow of stock in the tube bank of the headbox of a papermaking machine and prevent the development of turbulence and uneven concentration... | 06/07/2005 |
| 6785947 | Method of producing a core board product A method of making core board product may be under the control of a processing unit. A first tubular core may be dispensed to a conveying portion to support the first tubular core at an interim location. The first tubular core may be conveyed to a flattening positio... | 09/07/2004 |
| 6758097 | Pressure gauge spring The pressure gauge spring is a responsive and easy to manufacture gauge for connection to a pressure source. The spring assembly comprises a coiled hollow tube having a first end and a second end with a body portion therebetween, the hollow tube adapted to produce a... | 07/06/2004 |
| 6758077 | Manufacturing method of cylinder A method of manufacturing a cylinder, includes a step of inserting a cored bar 2 into piping material 1 having a reduced inner radius at one end and supporting the end of the cored bar with the reduced radius section of the piping material 1. Th... | 07/06/2004 |
| 6745610 | Method of manufacturing arm While one end of a material (31) that has nearly the same diameter as that of a first connecting portion (15) is secured, pressure is applied to the portion between the middle and the other end of the material (31). A slender portion (32)... | 06/08/2004 |
| 6729009 | Method for connecting workpieces by cold forming The invention relates to press tools for the connection, by cold forming, of tubular workpieces (2, 3) whose connection regions are provided with circular external cross-sectional shapes and are pushed one into the other. The press jaws (10) of the pre... | 05/04/2004 |
| 6655182 | Apparatus and method for reshaping tubes In a method of reshaping a tube, an apparatus is used which has a roller nip for rotating the tube, and a shaping roller assembly for altering the cross-section of the tube, for instance from round to oval.... | 12/02/2003 |
| 6536255 | Multivoid heat exchanger tubing with ultra small voids and method for making the tubing This invention is a process for making micro-multiport tubing for use in heat exchangers. The tubing is a flat body with a row of side-by-side passageways, which are separated by upright webs. Processing of this tubing involves extrusion, a straightening ... | 03/25/2003 |
| 6523385 | Process for preparing the end of a pipe for drawing over a mandrel A process for preparing the end of a pipe for drawing over a drawing mandrel, including the following steps: (a) inserting a preforming mandrel into an end of the pipe, the preforming mandrel having a first section having a diameter which is substantially... | 02/25/2003 |
| 6467322 | Pipe shaping method A pipe shaping method forms a narrow neck at one end of a workpiece in the form of an elliptical pipe having a cross sectional shape elongated in a predetermined elongating direction, with a roller. The pipe shaping method includes the following steps of:... | 10/22/2002 |
| 6442988 | Methods of spin forming initially cylindrical containers and the like A method of spin forming an open-ended container or other cylindrical metal workpiece by inserting a conically tapering mandrel coaxially therein and pressing the side wall of the workpiece against the inserted mandrel with plural symmetrically arranged f... | 09/03/2002 |
| 6101858 | Forming method for forked artistic aluminum or copper alloy pipes A method for forming artistic forked pipes made of aluminum or copper alloy, including the steps of selecting of extruded material, milling for making an extruded pipe, enlarging the bore of a main pipe, and forming to form forked branch pipes. Wherein, a... | 08/15/2000 |
| 5901594 | High pressure expansion mandrel with cams engaging oppositely directed ends of an expandable segmented ring A high pressure mandrel for joining a metal tube to a wall of a metal sheet surrounding an annular bore of the metal sheet. The metal tube enters the bore of the metal sheet. The metal tube is joined to the metal sheet by high pressure fluid in an annular... | 05/11/1999 |
| 5899106 | Process for manufacturing a shaped metal can A process for manufacturing a shaped metal can comprising, on one hand, a bottom (1), a cylindrical peripheral wall (2) in one piece with the bottom (1) and including at least one geometrically expanded region (2A, 2A) and, on the other hand, a lid crimpe... | 05/04/1999 |
| 4809423 | Making seamless steel pipes A method of forming seamless metal tubing and pipes of large diameter in excess of 500 mm diameter. A thickwalled hollow body is made by continuous casting. Rolling the continuously cast hollow body over a mandrel in an oblique rolling mill to the desired... | 03/07/1989 |
| 4765174 | Texture enhancement of metallic tubing material having a hexagonal close-packed crystal structure A method of producing tubing composed of material, such as zirconium and alloys thereof, having a hexagonal close-packed crystal structure is provided which increases the radial texture or orientation of basal poles in the crystal structure of the materia... | 08/23/1988 |
| 4683014 | Mechanical stress improvement process A process is claimed for removing the residual tensile welding stresses in the inner layer of the weld metal and the heat-affected zone of steel piping elements that have been butt-welded to each other end-to-end by means of a circumferential weld. The pr... | 07/28/1987 |
