Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7302779 | Method and apparatus for masonry chimney flue repair An apparatus for repairing cracks, crevices, joints, and other discontinuities in a chimney flue liner, comprises a flexible, resilient applicator having a liquid impervious rubberized coating. An electrical vibrator is installed within the applicator, for tamping t... | 12/04/2007 |
| 7192270 | Tight pitch nozzle with individual valve gate control An injection molding system is disclosed. The system includes a multiple valve gated nozzle. The flow through each valve gate is determined by individually operated valve pins. Each valve pin is independently controlled by a separate actuation unit. In order to achi... | 03/20/2007 |
| 6708728 | Installation of cured in place liners with air and steam and installation apparatus A process for lining an existing pipeline or conduit with a flexible resin impregnated cured in place liner by pulling in the liner and inflating an eversion bladder with air and curing the liner with flow-through steam without loss of pressure is provided. The line... | 03/23/2004 |
| 6244846 | Pressure containment device for everting a flexible liner A pressure containment device enables the installation of an everting liner without requiring a shipping container that can be pressurized. A pressure housing provides an inlet for receiving the liner and an outlet for installing the liner into the boreho... | 06/12/2001 |
| 5950394 | Method of fabricating decorative wall A constructed wall structure and method of fabrication that replicates a wall formed by nature. The structure has a plurality of discrete layers, with each layer constructed of concrete and a decorative additive. Every layer has an interface with an adjac... | 09/14/1999 |
| 5431553 | Manhole seal molding apparatus An apparatus is provided for installation in a manhole assembly. The mold apparatus is filled with a sealing material to establish a solid bond that blocks inflow of fluids at the joint between abutting components of the manhole assembly. The apparatus in... | 07/11/1995 |
| 5273414 | Method and apparatus for installing a pipe liner A process for installing a liner in a generally horizontal pipe section includes the steps of: providing a hollow generally cylindrical folded pipe liner having a reduced cross section sized to allow the liner to be slidably drawn into the pipe section fr... | 12/28/1993 |
| 5253955 | Automatically advancing supporting and sliding form for introducing an in-situ concrete lining A slide formwork with a formwork body (10) comprising several formwork segment groups (12, 22, 32) lying adjacent to one another in circumferential direction. Each of the formwork segment groups (12, 22, 32) is rigidly connected with one of several suppor... | 10/19/1993 |
| 5198246 | Concrete molding device A concrete molding device is provided for settling poured concrete. In a preferred embodiment, the form is composed of a plurality of segments stacked one upon the other, each having at least one strengthening flange located on its inner periphery. A vibr... | 03/30/1993 |
| 5154936 | Apparatus for everting a tube In a tube eversion apparatus a first chamber in which the eversion pressure is developed is controllably sealed by a sphincter-type valve, the valve being in turn actuated by pressure developed in a preferably separately controllable and adjustable second... | 10/13/1992 |
| 5108671 | Concrete formwork and method for forming a draft tube A formwork for a draft tube which includes ganged precast forms, each precast form corresponding to a curved segment of the draft tube. The precast forms are molded with continuous side plates extending thereabout and anchored in the precast concrete form... | 04/28/1992 |
| 5059067 | Method for forming a curved interior profile to a cementitious material A method for forming cementitious material, such as gunite or the like, to a desired cross-sectional profile for an interior structure such as a swimming pool, skateboard bowl or the like. A forming assembly includes a cutting edge, which is formed so as ... | 10/22/1991 |
| 5056959 | Method and device for stripping from the concrete to which it adheres the header of a wall section cast in the ground Apparatus for stripping a header from a cast concrete section to which it is adhered adjacent to a site for contiguous concrete section comprising a vertical track in direct association with the header; the track having an opening facing the site; and imp... | 10/15/1991 |
| 5017313 | Method and means for repairing existing manhole A form assembly for casting a lining wall in an existing manhole includes a cylindrical lower form assembly, a circular horizontal form assembly, and a cylindrical upper form assembly. All three assemblies are formed of smaller segments which are assemble... | 05/21/1991 |
| 4995584 | Cast-in-place manhole liner apparatus Apparatus for casting poured concrete liners in manholes or the like wherein a collection of sheet-metal, flanged, arcuate panels is provided which panels can be assembled in belts of generally circular cross-section commencing from the bottom of the manh... | 02/26/1991 |
| 4818142 | Method and apparatus for constructing a walled pool excavation A method and apparatus are provided for forming a cementitious walled ground excavation outwardly of which ground settling is substantially eliminated. A form wall footing is initially erected and leveled upon the bottom of the excavation inward of the wa... | 04/04/1989 |
| 4813813 | Method for constructing a tunnel The known method for constructing a tunnel of the type in which a shield tunnelling machine is shoved by means of a concrete lining jack and a shield jack equipped on the shield tunnelling machine with reaction forces received by concrete for lining place... | 03/21/1989 |
| 4806043 | Method and device for drainage of borders of all stabilized civil engineering areas or of adjacent borders of a structure A vertical drainage element is constructed and laid in position while at the same time forming a narrow vertical channel in the ground by means of an excavating machine or trencher by performing the following successive operations: a strip of filtering ma... | 02/21/1989 |
| 4799872 | Slipform apparatus for emplacing horizontal arcuate re-inforcing rods A slip-form of the kind for defining at least one surface of a wall-space into which concrete is to be poured. The slip-form includes a plurality of spaced apart upwardly extending members and to facilitate the locating of reinforcing rods at selected pos... | 01/24/1989 |
| 4793736 | Method and apparatus for continuously boring and lining tunnels and other like structures Disclosed is a continuous tunneling and lining machine. The machine is capable of simultaneously boring and lining a tunnel through a solid medium. The machine comprises four major components including: (1) an excavation system; (2) a debris removal syste... | 12/27/1988 |
| 4769192 | Pulsating slip form apparatus and method A method and apparatus for forming wet concrete employing a slip form having a radially expandable elastic outer shell comprising pouring concrete around the exterior surface of the outer shell and applying a fluid under pressure to the interior surface o... | 09/06/1988 |
| 4708533 | Method and a device for guiding a concrete feeding hose in connection with the grout feed in rock bolting The invention relates to a method and a device for guiding a concrete feeding hose in connection with the grout feedin rock bolting. The concrete feeding hose is therein passed by means of a feeder froma reel into a guide head supported on a feeding beam ... | 11/24/1987 |
| 4708532 | Apparatus for storing a concrete feeding hose in a rock bolting device A device for storing a concrete feeding hose in a rock bolting device, comprising a reel for a hose, which reel is mounted rotatably on a supporter, and that end of the hose which is attached to the reel is connected to concrete feeding means. In order th... | 11/24/1987 |
| 4629363 | Continuous conduit laying apparatus A continuous concrete encased conduit laying apparatus is attached to the rear of a tractor in a cantilevered fashion and can be raised and lowered into the ground by the tractor. The apparatus has two sections which are pivotally attached to each other. ... | 12/16/1986 |
| 4564314 | Self-propelled continuous concrete pipe-laying machine A self-propelled machine for casting in place heavy concrete sewer pipes in a pre-dug trench employing a detachably mounted winch on the forward end of the machine for connection to a deadman for pulling the machine along the trench.... | 01/14/1986 |
| 4544515 | Method for producing in-situ concreted piles with enlarged bases A method and apparatus for producing in-situ concrete piles with enlarged bases. The method includes the steps of: driving into the ground a tube provided at its lower end with a shoe which is larger than the diameter of the tube, and with an outer casing... | 10/01/1985 |
| 4540358 | Apparatus for the manufacture of a precast building element of concrete Apparatus for manufacturing a hollow concrete slab by a slide casting operation. The slab is formed with one or more cavities through the use of tubes of flexible material into which a pressurized medium, particularly water, is fed. The apparatus comprise... | 09/10/1985 |
| 4507069 | Apparatus for positioning and stabilizing a concrete slab A method of lifting and stabilizing a concrete slab having an opening therein in which a plate is attached to the top surface of the slab, the plate having an opening coinciding with the opening in the slab, a hydraulic jack having a downwardly extending ... | 03/26/1985 |
| 4415269 | Device for providing a reinforced foam lining for well bore holes A reinforced hardened foam lining may be constructed in a particular zone of a well such as a water well, a geothermal well, or an oil well to plug off or contain salt water intrusion or lost circulation by placing a length of perforated pipe in the desir... | 11/15/1983 |
| 4407609 | Apparatus and method for providing negative buoyancy for tunnel forms A method and apparatus for eliminating the necessity of providing hold-down devices, such as spuds and anchors, for opposing buoyancy in tunnel forms. The method comprises providing a movable counterweight car which preceeds the flow of fluid concretes, a... | 10/04/1983 |
| 4400108 | Mobile reinforced concrete pipe machine A mobile reinforced pipe machine for producing and laying concrete pipe on site in a ditch or the like. The machine comprises a frame structure capable of supporting the machine for movement along a ditch; hydraulically positionable outrigger wheels carri... | 08/23/1983 |
| 4370113 | Apparatus for repairing leaks in underground pipe An apparatus for repairing leaks in underground pipe which comprises a carriage movable axially along the pipe, a flexible and stretchable tubular cover sheet surrounding a portion of the carriage, a plurality of power driven back-up plates supported by t... | 01/25/1983 |
| 4324539 | Concrete pressure monitoring device for monolithic concrete structure forming apparatus A concrete pressure monitoring device in an apparatus for continuously forming an elongated monolithic concrete structure within a prepared excavation. The device includes a pressure sensitive membrane exposed to wet concrete between a bottom surface of t... | 04/13/1982 |
| 4314775 | Method of site casting tunnels, culverts, pressure pipes with minimum forming A method is disclosed for the construction of structures for tunnels, culverts, and pressure pipes of any size and shape, straight or curved, constant or variable cross section. The method requires very little formwork, with all work done on site. The met... | 02/09/1982 |
| 4298296 | Form handling system A system is described whereby a large elongated monolithic conduit is formed within an excavation of a single continuous pour of concrete. The open core of the conduit is formed by an interconnected group of tubular form members, forming a static line wit... | 11/03/1981 |
| 4270876 | Method of lining a vertical mine shaft with concrete The apparatus includes a cylindrical retainer form spaced inwardly of the wall of the shaft by the desired thickness of the liner to be poured and having overlapping edges which seal against concrete flow but permit the form to be contracted to a smaller ... | 06/02/1981 |
| 4261542 | Improvements in retractile tunnel forms for poured concrete This invention relates to U-shaped tunnel-type forms for poured concrete having an upper horizontal panel resting on two spaced vertical sides which, in turn, are separated on the ground by a combination of jacks and wheels. The bottom portions of the two... | 04/14/1981 |
| 4261541 | Manhole sewer pipe opening blockout member An improved manhole concrete blockout for forming sewer pipe openings in the cast-concrete wall of a manhole where a hole is dug in the ground and at least one vertical hollow form is positioned within the hole and spaced apart from the surface which defi... | 04/14/1981 |
| 4205949 | Slipform apparatus for vertical bores A slipform apparatus is described for forming a continuous upright monolithic lining within a preformed upright shaft. The slipform is provided in three independently movable sections that may be lowered into the shaft. Wet concrete is delivered to the se... | 06/03/1980 |
| 4181484 | Device for forming underground pipelines Apparatus for building underground pipelines by forming a casing in a hole from a forming material which is compacted in the direction from the center of the hole towards its walls. The hole is first filled with the forming material throughout its cross-s... | 01/01/1980 |
