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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 7726028 | Cutting device for pipelines A cutting device for cutting or bursting a pipeline includes a basic body having at least one cutting or perforating element, wherein the cutting or perforating element discontinuously cuts the pipeline in the longitudinal direction or at least discontinuously weake... | 06/01/2010 |
| 7434315 | Method and device for pipe splitting A device and method for pipe replacement is shown. A pipe replacement device is shown that includes at least one scoring wheel to provide a more progressive cut that provides consistency in the split of the pipe. A pulling force is reduced using pipe replacement dev... | 10/14/2008 |
| 7353889 | Rotary driven pipe-bursting tool An apparatus for bursting pipe is preferably adapted to receive rotational energy from the inner member of a dual-member drill string. In a preferred embodiment, a plurality of pipe-bursting members, driven by the interconnected inner members, cut or burst a subterr... | 04/08/2008 |
| 7172370 | Cutting system, device, and method for splitting pipes A cutting system for splitting pipes includes a main body and at least one blade and at least two blade mount assemblies by which the blade may optionally be connected to the main body. The first blade mount assembly, in a particular fitted state, holds the blade at... | 02/06/2007 |
| 7146716 | External tube extraction device with a cylindrical collapsing wedge The invention is related to a tube extracting device for removing a tube from a conventional drum of a boiler or heat exchanger. The device includes a wedge which is driven into a tube hole between the tube outer wall and the hole in the drum that the tube is in. Th... | 12/12/2006 |
| 7032586 | Single point engraving cutter tip An improved single point engraving burin tip, for use in hand engraving and stone setting in the hand engraving and jewelry fields. More specifically, the invention provides a single point engraving tip with a secondary relieving area to the primary cutting edge. | 04/25/2006 |
| 7000302 | Process for preparing a radio frequency cable for coupling Radio frequency cables have a inner circular conductor and an outer circular conductor. The inner and outer circular conductors are usually formed from copper and are separated by a heavy insulation layer usually cellular polyethylene. The outer side of the outer co... | 02/21/2006 |
| 6892753 | Structure for converting a mechanical joint to a fusion joint The converter for converting a mechanical joint to a socket fusion joint includes a body having an inner surface, a stop disposed on the inner surface, and a fusion surface extending from the stop for a distance d1. The converter also includes a marker dispos... | 05/17/2005 |
| 6769181 | Crimped-ring removal device Apparatus is provided for removing a crimped ring from plastic tubing installed over the nipple of a fitting. A supporting jaw radially supports the crimped ring while a chisel cuts the ring on a tangential path. One embodiment uses pair of levers joined and pivoted... | 08/03/2004 |
| 6655406 | Hot tapping apparatus and method An apparatus and a method of hot tapping a conduit and inserting a sensor is disclosed wherein the conduit is hot tapped and the sensor inserted in one step. The apparatus includes a first cavity, a propellant disposed in a first end of the first cavity, ... | 12/02/2003 |
| 6640827 | Hot tapping tool A hot tapping tool having a stationary tubular member threadedly engaged to a movable tubular member adapted for rotational and axial movement with respect to the stationary member with said movable tubular member operably connected to a shaft having cutt... | 11/04/2003 |
| 6382877 | Method of installing replacement pipe and apparatus therefor The invention concerns the replacement of underground pipes (52) wherein a former/cutting blade device (10) is pulled along the line of the existing pipe (52) by a cable fed (30) previously into the existing pipe (52). As the device (10) is so pulled it c... | 05/07/2002 |
| 6378212 | Pipe entry device The present invention relates to a pipe cutting device for cutting a pipe or conduit. The device includes a first supporting portion and a second supporting portion associated with the first supporting portion. The first and second supporting portions are... | 04/30/2002 |
| 6340270 | Apparatus and method for the longitudinal splitting of pipes laid underground An apparatus for longitudinal splitting, in particular longitudinal slitting, of pipes laid underground and for the simultaneous trenchless pulling-in of a new pipeline comprises a carriage in the form of a frame, in which a cutting wheel for cutting open... | 01/22/2002 |
| 6092553 | Method of installing re-placement pipe The invention provides that an existing underground pipe (52) is replaced by pulling a cutting device (10) through the existing pipe (52) by means of a strong steel stranded cable, and at the same time pulling the replacement pipe (26) along behind the cu... | 07/25/2000 |
| 6029355 | Device for cutting soil sampling tubing A device for longitudinally cutting tubing is comprised of a block presenting an engaging surface for receiving tubing, blades and protective guards both coupled to the block and both extending beyond the engaging surface, and a handle coupled to the bloc... | 02/29/2000 |
| 6014810 | Portable tubing cutter A portable cutter for cutting materials such as conduit tubing made of metal or other semi-rigid material including a motor, a power source for the motor, a saw blade, gripping mechanism for gripping an object to be cut, mechanism for automatically connec... | 01/18/2000 |
| 5819417 | Hose clamp cutting device A tool for cutting elastomeric type hose clamps that are applied by shrink wrapping techniques includes a tubular member with a telescoping rod therein. A blade is attached to the rod. As the handle grips, attached to the rod and the tube, are manually ma... | 10/13/1998 |
| 5806188 | Slotter A slotter capable of providing a cut of precise depth into a tube is comprised of a main base and an adjustable roller base capable of extension and retraction from the main base, controllable by an adjustable over-center actuator linkage. A pair of rolle... | 09/15/1998 |
| 5791364 | Attachment for stopper for plastic gas pipelines An inflatable gas pipeline stopper is used for stopping gas flow through pipelines to permit repairs to be made to gas pipelines. For plastic gas pipelines, a tapping tee is attached to the plastic gas pipeline and a gas tight apparatus having a valve is ... | 08/11/1998 |
| 5645104 | Line evacuation device A device for use in evacuating fluid from a tubular refrigerant line comprises an elongated hollow tubular frame, which has a line seating extension attached to an open end of the frame and spaced from the end for engaging a refrigerant line in a position... | 07/08/1997 |
| 5544977 | Polymeric pipe splitter, replacement tool and method A tool and method for splitting an existing underground polymeric pipe into a plurality of strips and for expanding the strips and the surrounding ground to permit replacement of the existing polymeric pipe along its length from an entry excavation to an ... | 08/13/1996 |
| 5460071 | Power driven casing splitter apparatus A carriage having rotary cutter wheels is mounting for reciprocation on a frame adapted to be rigidly secured to a pipe casing which is desired to be split along a line parallel to its axis. A hydraulic motor is mounted to the frame at one end of the carr... | 10/24/1995 |
| 5306101 | Cutting/expanding tool A cutting/expanding tool includes a cylindrical support body having a guide side and a cutting side, a pair of guide rollers mounted in tandem along the longitudinal axis of the support body on the guide side, a cutting wheel mounted between the tandem gu... | 04/26/1994 |
| 5185928 | Window cutter for gas service tie overs and tie-over method A pipe slitter comprises a base for fixing the slitter to a pipe to be slit thereby. The base includes a pair of end plates for mounting transversely of the pipe and a carriage guide for coupling the end plates to each other. The carriage guide extends lo... | 02/16/1993 |
| 5171106 | Cutting/expanding tool A cutting/expanding tool includes a cylindrical support body having a guide side and a cutting side, a pair of guide rollers mounted in tandem along the longitudinal axis of the support body on the guide side, a cutting wheel mounted between the tandem gu... | 12/15/1992 |
| 5127481 | Percussion boring machine for destructive replacement of buried pipelines A percussion boring machine for destructive replacement of buried pipelines, having an opening-out cone at the back of the machine housing and cutters spaced in front of said cone, wherein the cutters form part of a breaking-up head slipped on to the hous... | 07/07/1992 |
| 5098225 | Cutting/expanding tool A cutting/expanding tool includes a cylindrical support body having a guide side and a cutting side, a pair of guide rollers mounted in tandem along the longitudinal axis of the support body on the guide side, a cutting wheel mounted between the tandem gu... | 03/24/1992 |
| 5078546 | Pipe bursting and replacement method Tool for slitting and laterally expanding underground steel gas mains and inserting replacement plastic piping into the spread apart pipeline has a forward end cylindrical portion mounting a single, rearwardly angled blade to make only one line of cut, an... | 01/07/1992 |
| 5009007 | Window cutter for gas service tie overs A pipe slitter comprises a base for fixing the slitter to a pipe to be slit thereby. The base includes a pair of end plates for mounting transversely of the pipe and a pair of connecting rods for coupling the end plates to each other. The connecting rods ... | 04/23/1991 |
| 5002432 | Device and method to cut and coil piles, casings and conductors A cutter-coiler device that economically cuts and coils cylindrical piles, casings and conductor pipes to a depth below the surface of the sea floor. Although the device will cut and coil cylindrical piles, casings and conductor pipes above the sea floor,... | 03/26/1991 |
| 4983071 | Pipe bursting and replacement apparatus and method Tool for slitting and laterally expanding underground steel gas mains and inserting replacement plastic piping into the spread apart pipeline has a forward end cylindrical portion mounting a single, rearwardly angled blade to make only one line of cut, an... | 01/08/1991 |
| 4977671 | Saw for cutting large diameter shielded conduit A hand tool for cutting shielded conduit comprising a first handle member for holding the conduit including clamping means for securing the conduit in a fixed position relative to the first member; a second handle member including a radial cutter head dis... | 12/18/1990 |
| 4903406 | Pipe splitter A pipe splitter having an elongated frame, a first end and a second end is disclosed. A first roller and a second roller is rotatably positioned proximate the first end and the second end of the elongated frame, respectively, to rotatably support the elon... | 02/27/1990 |
| 4807348 | Hydraulically actuated lockbolt collar cutter and method of cutting a collar Method and Tool for removing a swaged collar from a pin member of a lockbolt type fastener by using a tool having a housing with an opening therein having opposite wall, one wall having a pair of fixed spaced blades extending longitudinally of the collar ... | 02/28/1989 |
| 4789268 | Device and method for removing irregularities in or enlarging an underground duct A device for removing irregularities in or enlarging a buried duct comprises a cylindrical housing corresponding approximately in diameter to the required diameter of the duct, an expandable shell comprising a plurality of tapered leaf members pivotally a... | 12/06/1988 |
| 4738565 | Method of replacing mains A method for replacing an existing buried pipe of a crackable, fracturable material. By the application of a local intense pressure, the pipe is cracked and fractured into irregular fragments which are spread outwardly to provide space for a new replaceme... | 04/19/1988 |
| 4732222 | Ram boring machine with impact blade piston In a ram boring machine for laying pipelines without trenching, a double blade that is axially moveable against a compression spring is housed in an impact tip and projects through slots in the impact tip. The double blade is struck by a striker piston an... | 03/22/1988 |
| 4720211 | Apparatus for replacing mains An apparatus for replacing an existing buried pipe of a crackable, fracturable material. The apparatus has a fracturing structure which applies an intense local pressure to crack and fracture the existing buried pipe into irregular fragments. This fractur... | 01/19/1988 |
| 4674914 | Replacing mains The invention relates to a self-propelled apparatus 1 for replacing main such as a gas main 2, comprising a single double acting hydraulic piston and cylinder combination 3 connected with slidable devices 4, 6 operable by the device for step-by-step movem... | 06/23/1987 |
