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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 |
| 7305798 | Composite overfilled arch system An overfilled arch bridge system includes a composite arch which has a precast layer and a cast-in-place layer. The system further includes means for reducing bending moments within the overfilled arch. The means include customizing the arch end geometry and prestre... | 12/11/2007 |
| 7234706 | Sealing system for multiple fluids A seal (301) has a first surface capable of contacting a valve cover (101) over a first fluid while a second surface, opposed to the first surface, is capable of contacting a seal seat (303). The seal (301) also has a third surface capabl... | 06/26/2007 |
| 7159664 | Method of passing insulated wires through a wellhead opening A method of extending an insulated wire through a wellhead opening of a well that includes casing having a top. The method makes use of an annular cap sized to engage and be retained by the top of the casing, the annular cap having smooth top and radially inward sur... | 01/09/2007 |
| 7156124 | Segment for rehabilitating an existing pipe and a rehabilitating pipe assembled using segments A segment for rehabilitating an existing pipe has an integral structure comprised of an inner plate having an inner circumferential surface that is planar or curved with a prescribed curvature, two side plates provided upright on each side edge of the inner plate, a... | 01/02/2007 |
| 7090459 | Hybrid seal and system and method incorporating the same A seal having a first seal mechanism adapted for insertion between a first structure and a second structure, wherein the first structure is in communication with a first medium and the second structure is in communication with a second medium. The seal also includes... | 08/15/2006 |
| 7056064 | Block unit for repairing flow passage facilities and method of repairing flow passage facilities A block unit for repairing flow passage facilities is provided for permitting a desired repair operation. A method of repairing flow passage facilities using the block unit is also provided. The block unit includes an inner plate defining an inner surface, an outer ... | 06/06/2006 |
| 7017613 | Segment for rehabilitating pipe assembly A segment is coupled to additional segments to constitute a rehabilitating pipe for repairing an existing pipe. The segment comprises an inner plate that defines the inner circumferential surface of the rehabilitating pipe and has an opening therein for performing t... | 03/28/2006 |
| 7018138 | Pier-repairing and reinforcing panel and method of repairing and reinforcing piers using such panels A pier-repairing and reinforcing panel is used in a method of repairing and reinforcing a pier. The panel includes locking members, locking ribs, reinforcing ribs, and clips. The method includes the steps of: installing a watertight caisson around a pier and removin... | 03/28/2006 |
| 7004679 | Easily-cuttable tunnel segment structure The present invention relates to a novel easily-cuttable tunnel segment structure used for the departure of a shield machine from a main tunnel to a branch tunnel or the return to the main tunnel from the branch tunnel, and provides an easily-cuttable tunnel segment... | 02/28/2006 |
| 7000597 | Flat gasket A flat gasket for sealing off a region, especially for sealing off a region bordered by a cylinder head cap, includes an elastic material that effects the sealing function and at least one pass-through region for passing through a conductor such that the conductor c... | 02/21/2006 |
| 6997640 | Backer rod for expansion joints A backer rod adapted for insertion into a construction joint having a polymeric foam body of closed-cell construction and a foraminous skin with both open and closed cells. The backer rod, when compressively inserted into a construction joint, is impervious to hot a... | 02/14/2006 |
| 6955502 | Method for repairing in-ground tunnel structures A method for repairing in-ground tunnel structure involves applying a first curable resin over a cementitious liner which lines the interior wall surfaces of the tunnel, drilling drainage holes in the cementitious liner, and filling the drainage holes with a second ... | 10/18/2005 |
| 6923600 | Method of repairing and reinforcing piers using stones A method of repairing and reinforcing a pier using stones. The method includes installing a watertight caisson around a pier and removing water from the gap between the caisson and pier prior to repairing the pier. The method can also include removing impurities fro... | 08/02/2005 |
| 6893188 | Continuous method of realization of works underground, tunnels and excavations in general with works of consolidation, permeabilization and drainage obtained through guided perforations Continuous method of realization of underground tunnels, including the steps of making a plurality of guided perforations of small cross-section around a periphery of an underground tunnel to be realized and extending at least a majority of length of the underground... | 05/17/2005 |
| 6612585 | Elastomeric strand-shaped sealing profile An elastomeric strand-shaped sealing profile including at least one continuous transverse beam located in a region between the base and rear side surfaces of the profile and having two sidewise projecting cantilever arms, two sealing lips provided on the ... | 09/02/2003 |
| 6592296 | Sealing assembly for tunnel construction sections A sealing assembly comprising two abutting components and a sealing profile produced from an elastomeric material, which bridges the gap between the two components to form a seal. The components are configured in particular as sections which are assembled... | 07/15/2003 |
| 6575664 | Sealing arrangement A sealing arrangement which comprises at least two abutting components that form a gap therebetween and a seal that sealingly bridges the gap. The inventive sealing arrangement is characterized in that the seal entirely consists of a matrix or is provided... | 06/10/2003 |
| 6554536 | Linings for sewers During manufacture of a sewer or tunnel lining section, sand-resin material is deposited over a mould, to define a central part of the section. Sand-resin material is removed using a wire arranged to lie a predetermined radial distance from the surface of... | 04/29/2003 |
| 6540438 | Inflatable underground structure liner The apparatus is an underground structure liner based upon an inflatable liner structure. An acid resistant layer is the innermost layer of an inflatable liner, and the liner is coated with epoxy resin on its outermost surface, the surface which contacts ... | 04/01/2003 |
| 6402611 | Hinged mine stopping The hinged mine stopping has at least two panels joined by a hinge defining a wall adapted for forming an air tight seal in a mine passageway to improve mine ventilation. Each panel has a lower section defined by a sheet of gas impermeable material mounte... | 06/11/2002 |
| 6328501 | Method of manufacturing a tunnel or shaft lining or pipeline A method of manufacturing a tunnel (10) or shaft lining or pipeline of segments (12), wherein each segment (12) comprises a concrete body (11) having an extrados (13) surface, an intrados (14) surface and first and second ends (15, 16) and first and secon... | 12/11/2001 |
| 6267536 | Sealing arrangement for tunnel segments A sealing arrangement (1) has two abutting construction elements made of concrete, steel, reinforced concrete, cast iron or other materials, as well as a sealing section made of an elastomer material which sealingly bridges the gap between the two constru... | 07/31/2001 |
| 6220787 | Ship type floating oil production system A ship type floating oil production system for access to subsea wells through installation of surface wellheads on a ship type surface vessel on the sea comprises a cylindrical turret moored to a seabed is located within a moon pool formed in the ship typ... | 04/24/2001 |
| 6164871 | Mine stopping having a swinging door A mine stopping comprising a wall extending across a passageway in a mine to close the passageway. The wall has an opening therein. A door is hinged adjacent the opening for swinging between a closed position in which the door closes the opening to inhibi... | 12/26/2000 |
| 6129485 | Seal and process for producing such seal The invention relates to a seal between a side face of a first part (11) and an application face (10), the seal being made of a compressible profiled lining (1) and being comprised of an internal portion (2) sealingly fixed to the first part (11) and an e... | 10/10/2000 |
| 5938375 | Method of sealing joints between adjacent sheet piling sections to form a continuous barrier and barriers formed using said method A method and device for sealing the joint formed by the connection of adjacent sheet piling sections. Prior to installation in the ground, a housing having an open side is attached near the edge of a sheet piling section. A barrier is inserted between the... | 08/17/1999 |
| 5888023 | Seal arrangement for tubular tunnel segments The invention relates to a seal arrangement consisting of two abutting structures of concrete, steel, reinforced concrete, cast iron or other materials and a sealing section of elastomeric material which bridges and seals the gap between the two structure... | 03/30/1999 |
| 5870871 | Sump liner and method of installation This invention includes repair of an existing underground sump without the need for costly and time consuming excavation. A plurality of liner-forming pieces are placed inside the underground sump to create a liner preferably substantially conforming to t... | 02/16/1999 |
| 5660501 | Corner area for tubbing seals A corner area has a corner piece which is inserted between two ends of the sealing profile strip of a sealing structure and is joined thereto. To facilitate the deformability of the corner piece when the sealing structure is pressed together under pressur... | 08/26/1997 |
| 5660912 | Plastic profiled strip forming helically wound tube using hinged flap for jointing A plastic profiled strip (10) is provided for producing helically wound tubes or pipes, the strip (10) having female and male joint formations (13, 14) extending along opposite longitudinal margins thereof and arranged so that upon spirally winding the st... | 08/26/1997 |
| 5634312 | Shear bolt connected structural units An apparatus is disclosed for joining structural units. A structural unit, such as a precast concrete section of pipe, decking, bridge structure, building structure, or pavement, includes a plurality of spaced, longitudinally aligned tubular members. The ... | 06/03/1997 |
| 5613806 | Sealing system for sewer and water applications A method and article for sealing a manhole riser a catch basin, and a pipe juncture. The method is an economical process whereby elastomeric bands are placed around and inside a manhole riser, a catch basin, or a pipe juncture and effectively seals the ma... | 03/25/1997 |
| 5537794 | Shear bolt connected structural units An apparatus is disclosed for joining structural units. A structural unit, such as a precast concrete section of pipe, decking, bridge structure, building structure, or pavement, includes a plurality of spaced, longitudinally aligned tubular members. The ... | 07/23/1996 |
| 5489164 | Method of connection The invention relates to a constructional element such as a tunnel lining, part of which is shown in the drawing, comprising adjacent segments which have facing surfaces between which there is a joint which is physically deformable under load. The joint c... | 02/06/1996 |
| 5472295 | Shield tunneling method using flexible segments, flexible segments for shield tunneling method, and flexible segments for secondary application of shield tunneling method A general segment 20 which is propelled and set in an excavated hole by a propulsion excavating machine, and a flexible segment where flexible members 4 and rigid ring members are alternately installed and connected inside the skin-plate 7 provided on the... | 12/05/1995 |
| 5470178 | Insulating tunnel liner system An insulating liner system especially adapted to railroad and highway tunnels to eliminate ice buildup on the tunnel crown, walls and roadbed caused by water leakage from the tunnel face. The insulating liner system includes a modular assembly of insulati... | 11/28/1995 |
| 5466093 | Method and apparatus for removing contaminants from a duct or pipe Contaminants are removed from the interior or a duct by the introduction within the duct of a tube having a coating of a curable, strippable resin using an everting/inverting membrane assembly. The coated tube is contained within the inverted membrane ass... | 11/14/1995 |
| 5452558 | Method for permanently repairing and sealing roofs A method is disclosed for permanently repairing roofs using a colloidal clay such as sodium montmorillonite (commonly called bentonite). A layer of particles of the colloidal clay is spread on the surface of the roof that is to be repaired so that the lay... | 09/26/1995 |
| 5439319 | Tunnel barrier system and method of installing the same A tunnel barrier system for lining the interior surface of a tunnel cavity includes a first panel in facing engagement with and affixed to a first impermeable membrane. A second panel is in facing engagement with and is affixed to a second impermeable mem... | 08/08/1995 |
| 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 |
