Did You Know...
...that the Slinky toy was the result of a failed attempt by engineer Richard James to produce an antivibration device for ship instruments? His goal was to develop a spring that would instantaneously counterbalance the wave motion that rocks a ship at sea. Instead, he developed the Slinky.
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| Number | Title | Issue Date |
| 7302961 | Surge relief valve A surge relief valve comprising a main valve body having a dome port and an inlet port. The inlet port is in fluid communication with a first fluid. The invention further includes a dome reservoir connected to the main valve body via the dome port and arranged to ho... | 12/04/2007 |
| 6673455 | Flexure endurant composite elastomer compositions A flexure endurant composition of an elastomer reinforced with a continuous phase of microporous, expanded polytetrafluoroethylene (ePTFE) having a ratio of elastomer to PTFE of approximately 1:1 to 50:1 on a volume basis. The composite is prepared by a c... | 01/06/2004 |
| 6607830 | Composite material for metal gasket The composite material for a metal gasket includes a metal plate; a rubber layer fixed on the surface of the metal plate; and a solid lubricant layer fixed on the rubber layer. The solid lubricant layer contains polytetrafluoroethylene and a resin as main... | 08/19/2003 |
| 6569493 | Method of repairing a paper machine dryer journal moisture barrier This invention relates to a method of repairing a moisture barrier separating a paper machine dryer drum from the dryer journal. Such processes of this type, generally, involve filling the cavity between the dryer drum steam intake pipe and the dryer jour... | 05/27/2003 |
| 6540264 | Quick connector for piping In a quick connector for piping 10 for detachably connecting a male member 12 to a female member 11, an O-ring 15 is interposed between the female member 11 and the male member 12 so as to form a seal therebetween, and the O-ring 15 is subjected to a low-... | 04/01/2003 |
| 6513810 | Sealing ring A sealing ring, including a support ring made of an impact-resistant material, and a lip ring made of PTFE, where the lip ring has a holding segment and a sealing segment, and where the holding segment is connected with the support ring by an intermediate... | 02/04/2003 |
| 6428014 | Piston sealing ring assembly A piston sealing ring assembly (70) for sealing the piston/cylinder interface of a double-acting gas compressor including a first and second cut piston sealing ring (54,72) each bounded by first and second planar surfaces (6,8), the first piston sealing r... | 08/06/2002 |
| 6398225 | Seal for a rotary valve for high temperature and high pressure fluids An improved seal for a rotary valve for high temperature and high pressure fluids. A removable seal member adapted for disposition between a valve body and a valve member rotatably disposed in the valve body is provided. In one aspect of the invention, th... | 06/04/2002 |
| 6367808 | Sealing ring for a dry running piston rod A sealing ring, in particular for a piston rod with a circular cross-section, which has a height in the axial direction as well as a surface oriented towards a sliding surface, with the surface being executed to extend cylindrically over a part of the hei... | 04/09/2002 |
| 6338491 | Rotary shaft seal An improved rotary shaft seal assembly is disclosed herein. The seal assembly is disclosed in combination with an example of transmission components with which it may be used. The assembly provides a rotary seal for fluid flow between a stationary cylinde... | 01/15/2002 |
| 6258457 | Metal-reinforced graphite multilayer sheet A multilayer sheet having high compressive strength, high heat resistance and low permeability relative to fluids, includes layers of graphite foils and metal foils disposed alternating one upon another and parallel, with the graphite foils joined to the ... | 07/10/2001 |
| 6241854 | Suction roll sealing strip A composite is provided for forming a sealing strip for use in a suction roll of a papermaking machine or other device for maintaining a seal when brought into contact with a surface and that has extended usability and wear. The composite is a blend of a ... | 06/05/2001 |
| 6240968 | Membranes suitable for medical use A modified polytetrafluoroethylene resin membrane material is provided for a variety of medical or other applications. The material may be used as a bandage, tissue barrier, article covering or coating. Layers of the membrane may be combined to form tubes... | 06/05/2001 |
| 6202668 | Valve with fire-resistant seal A valve with fire-resistant seal for use in industrial piping applications. The valve includes a valve body with a valve element therein. The valve is illustrated as a ball valve, but other valve configurations could also be used. A valve stem engages the... | 03/20/2001 |
| 6092811 | Hybrid gasket A hybrid gasket includes a core defining an aperture therein, the core having an outer edge portion and an inner edge portion immediately surrounding the aperture. The gasket further includes a chemically resistant material encapsulating the inner edge po... | 07/25/2000 |
| 6089576 | Low creep polytetrafluoroethylene gasketing element The present invention is an improved gasket for use in a wide variety of sealing applications. The gasket comprises a sheet of expanded polytetrafluoroethylene (PTFE) that is helically wrapped around itself and sealed in that orientation. This constructio... | 07/18/2000 |
| 6045885 | High pressure, high temperature gasket A gasket for high pressure, high temperature apparatus is disclosed which is of a generally frusto-conical shape. The smaller diameter portion of the gasket is made primarily from low friction material and the larger diameter portion of the gasket is made... | 04/04/2000 |
| 6045135 | Sealing ring disk A sealing ring disk for a seal at a piston rod with a circular cross-section. The sealing ring disk includes a ring-shaped seal part with a sector-like cut-out as well as a closure part having a main part matched to the cut-out in such a manner that the m... | 04/04/2000 |
| 6030694 | Rigid sheet polytetrafluoroethylene material A composite fluoropolymer material contains outer layers consisting essentially of conformable porous polytetrafluoroethylene (PTFE) and interior layers consisting essentially of rigid fluoropolymer material which may be a densified expanded PTFE, wherein... | 02/29/2000 |
| 6019571 | Side channel compressor Side channel compressor, in which the gap (7) existing between the rotor (2) and the housing parts (1) surrounding the rotor (2) is sealed off using a sealing tape (8) introduced into a peripheral groove (9) provided in the corresponding wall regions of t... | 02/01/2000 |
| 5997979 | Spherical annular seal member and method of manufacturing the same A spherical annular seal member which has a cylindrical inner surface defining a through hole in a central portion thereof as well as an outer surface formed in the shape of a partially convex spherical surface, and which is used particularly in an exhaus... | 12/07/1999 |
| 5992857 | Composite gasket The composite gasket of the present invention has improved various properties which are different depending on use conditions, while ensuring sealing properties, by combining a seal material which is selected in accordance with the properties of certain s... | 11/30/1999 |
| 5961128 | Expansion seal Expansion seal ring with an essentially torus shaped expansion seal (1) which is provided between two concentric positionable connection pieces (2, 3) to be sealed or the like, which include a sealing section (1a) which is pulled over the edge (3a) of one... | 10/05/1999 |
| 5945192 | Sealing assembly for a solid polymer ion exchange membrane An assembly consisting of at least one seal layer and a solid polymer ion exchange layer wherein the seal layer covers essentially only the region of the ion exchange layer which is to be sealed. The seal layer is made of porous polytetrafluoroethylene fi... | 08/31/1999 |
| 5882012 | Oil seal ring An oil-submerged sliding member which has a good sealability and wear resistance and low attack to the mating member and which can be used with either a soft or a non-soft mating member. It is made from a resin composition comprising 30-88% by weight of a... | 03/16/1999 |
| 5879789 | Rigid sheet polytetrafluoroethylene gasket An improved, chemically resistant gasket is constructed from a composite containing outer layers consisting essentially of conformable expanded polytetrafluoroethylene (PTFE) and interior layers consisting essentially of a densified expanded PTFE, wherein... | 03/09/1999 |
| 5876566 | Suction roll sealing strip A composite is provided for forming a sealing strip for use in a suction roll of a papermaking machine that has extended usability and wear. The composite is a blend of a nitrile rubber, graphite, carbon black, and polytetrafluoroethylene, optionally with... | 03/02/1999 |
| 5874170 | Seal for movable structural components A seal for movable structural components, such as piston rods or shafts, includes a carrier body made of plastics and a sealing member made of polytetrafluoroethylene (PTFE) material and bonded to the carrier body. A plastic material may be mixed with the... | 02/23/1999 |
| 5792525 | Creep resistant shaped article of densified expanded polytetrafluoroethylene A creep resistant article is provided which is dimensioned from a stock material consisting essentially of a plurality of layers of expanded polytetrafluoroethylene which has been densified. The expanded polytetrafluoroethylene exhibits remnants of a fibr... | 08/11/1998 |
| 5725221 | Two piece seal A dynamic two-piece seal comprising a first member unaffected by the pressurization of the seal. A second member of the seal has projections which prevent relative motion between the first and second seal members.... | 03/10/1998 |
| 5695197 | Seal ring method of sealing and molding composition comprising blend of PTFE copolymer, polyamide and carbon fiber therefor A set for preventing flow of a fluid under pressure between a first surface and a second surface spaced-apart from the first surface. The seal is molded or otherwise formed from a composition comprising a blend of from about 79-87% by weight of a copolyme... | 12/09/1997 |
| 5676384 | Anti-extrusion apparatus made from PTFE impregnated steel mesh A low friction, dry lubricant impregnated anti-extrusion apparatus for engagement with an annular seal or packer, wherein said packer is used to seal the annular space of a well or pipe bore. The low friction, dry lubricant impregnated anti-extrusion appa... | 10/14/1997 |
| 5674055 | Piston sealing arrangement for a sampling pump system An improved sampling pump has utility for withdrawing fluid from a pressurized source and outputting fluid to a sampling container. The fluid pump assembly of the present invention includes an operator unit for reciprocating a plunger, and a side body por... | 10/07/1997 |
| 5628520 | Sealing material made of expanded graphite having opened thin-leaf surface structure An expanded graphite sealing material is provided in which the adaptability of the principal face of an expanded graphite base member is improved, the bonding strength to a coating layer and the like can be increased, and the sealing properties can be enh... | 05/13/1997 |
| 5611678 | Shaft seal arrangement for air driven diaphragm pumping systems An air driven diaphragm pump having two diaphragms joined by a common control shaft to reciprocate in opposed chambers for pumping material through check valve ported cavities. An actuator valve is associated with the central housing of the pump and inclu... | 03/18/1997 |
| 5611260 | Piston ring mount structure A piston ring of Teflon (trademark of E.I du Pont de Nemours & Co, Ltd.), i.e., polytetrafluorethylene fiber, is mounted on a piston. The piston ring has an integral portion in the form of a series of axially spaced circumferential projections received in... | 03/18/1997 |
| 5593166 | Low friction packing A two-part, low friction, live loaded packing system for fire safety and low fugitive emission sealing (less than 500 ppm) of a valve stem at operating temperatures up to 450° F. (232° C.). One lower packing ring set around the valve stem has PTFE washe... | 01/14/1997 |
| 5584577 | Seal for a food blender A domestic blender having a blade carried on a shaft, with the shaft being supported for rotation within a sleeve shape bearing is provided with a seal to prevent passage of liquid into an area between the blade shaft and the bearing. The seal is an annul... | 12/17/1996 |
| 5577737 | Method and apparatus for establishing and maintaining a fluid seal around a polishing rod The invention is a sealing apparatus and method of providing a seal for polished rods in oil and gas well applications. The sealing apparatus has a fluid responsive gland which forms a seal between the inner surface of a unitized housing body and a polish... | 11/26/1996 |
| 5564715 | Tandem seal device for flow line applications A tandem seal device is provided for interposing and compressing between joined pieces of pipe in a flow line to prevent fluid leakage therebetween. The tandem seal device comprising a retainer body having an inner pair and an outer pair of continuous gro... | 10/15/1996 |
