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Felix Hoffmann, a German chemist, was searching for something to relieve his father's arthritis. In doing so, he "rediscovered" acetylsalicylic acid and in 1900, patented a stable process for developing it. Hence, we have aspirin.
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| Number | Title | Issue Date |
| 7229102 | Fluid coolant union A coolant union includes a seal assembly having a first seal member and a non-rotating second seal member. At least one of the annular sealing surfaces presented by the rotating seal member and the non-rotating seal member is chamfered such that the chamfered sealin... | 06/12/2007 |
| 7191875 | Disc brake A disc brake includes a piston seal made of rubber that is shaped to fit into a seal groove on the inner surface of a cylinder of a caliper for a brake piston. To prevent braking effectiveness from being impaired, even if the temperature of a caliper rises in a disc... | 03/20/2007 |
| 7083170 | Rod or piston primary seal A rod or piston primary seal, which includes a primary seal (2) facing the space (1) to be sealed and a secondary seal (3) facing away from it, in which the primary seal (2) is fitted into the groove (4), of a holding element (5... | 08/01/2006 |
| 6991236 | Device for securing a sealing member in a predetermined position A device for securing a sealing member in a predetermined position. The device comprises a positioning element of a predetermined size and shape having a first surface and a second surface, and a retaining element of a predetermined size and shape disposed on at lea... | 01/31/2006 |
| 6942220 | Combination metal gasket and seal structure The present invention provides a combination metal gasket that is formed by fitting a ring-shaped metal base elastic structure in at least one trough portion of two trough portions of a ring-shaped metal gasket that has an S-shaped longitudinal cross section. The co... | 09/13/2005 |
| 6758478 | Elastomeric seal anti-extrusion wedge backup ring and flange A seal assembly for a shaft has a flange fixed to a work piece having a bore hole therein. The flange encircles the shaft and includes a triangular shaped projecting member having first and second surfaces extending from the flange into the bore hole. An angle is fo... | 07/06/2004 |
| 6752223 | Roller cone bit with improved seal gland design In the seal gland in a rotating cone drill bit, the O-ring is initially compressed between the journal and a central portion of the gland which has a cross-section parallel to the journal. These two concentric surfaces provide a minimum amount of contact pressure fo... | 06/22/2004 |
| 6676131 | Sealing ring for a centrifugal separator Sealing ring (1) for a centrifugal separator with an axially open annular groove (7) for the sealing ring in a first rotor part (2) and a relative to the first rotor part (2) axially movable second rotor part (3), against which the sealing ring (1) sealin... | 01/13/2004 |
| 6494465 | Seals for hydraulic assemblies A seal for hydraulic assemblies operating at high temperatures having adaptations (19, 20, 49, 50) for low pressures sealing and configured to move across the gap to be sealed at higher pressures with an angled base on a slope (23, 44) or a cup shape (73,... | 12/17/2002 |
| 6431552 | Rotary shaft sealing system A rotary shaft sealing system comprising a rotary lip seal and its associated retention gland, wherein the each of the seal and the gland are complimentary of the other within the environment of use. The system is particularly adapted for the sealing of a... | 08/13/2002 |
| 6279671 | Roller cone bit with improved seal gland design In the seal gland in a rotating cone drill bit, the O-ring is initially compressed between the journal and a central portion of the gland which has a cross-section parallel to the journal. These two concentric surfaces provide a minimum amount of contact ... | 08/28/2001 |
| 6056294 | Self-energizing one piece seal A self energizing one piece seal has an annular seal body and a multiplicity of circumferentially spaced delta shaped resilient tabs extending inwardly from the annular body. The seal is adapted to be placed in an annular groove of a cylindrical member so... | 05/02/2000 |
| 6036192 | Skew and twist resistant hydrodynamic rotary shaft seal A hydrodynamically lubricated squeeze packing type rotary shaft seal suitable for lubricant retention and environmental exclusion which incorporates one or more resilient protuberances which and cooperate with the gland walls to hold the seal straight in ... | 03/14/2000 |
| 5873576 | Skew and twist resistant hydrodynamic rotary shaft seal A hydrodynamically lubricated squeeze packing type rotary shaft seal suitable for lubricant retention and environmental exclusion which incorporates one or more resilient protuberances which and cooperate with the gland walls to hold the seal straight in ... | 02/23/1999 |
| 5330201 | Sealing assembly A sealing assembly for sealing between two relatively rotatable cylindrical surfaces. The assembly comprises two seal parts (46, 48) disposed in a groove (40) in one of the surfaces so that one of said parts is disposed radially outwardly of the other. On... | 07/19/1994 |
| 5325940 | Disc brake cylinder groove with a recess consisting of three sector surfaces A disc brake having a brake caliper provided with a hydraulic actuating device including a brake cylinder and a brake piston. The brake piston is sealed relative to the brake cylinder by way of a sealing ring arranged in a surrounding annular groove of th... | 07/05/1994 |
| 5117066 | Retaining and locking electromagnetic gasket An electromagnetic shielding spring gasket assembly includes a coil spring for blocking the propagation of electromagnetic waves therepast. The coil spring includes a plurality of coils having a major and a minor axis and canted along a center line define... | 05/26/1992 |
| 5079388 | Gasket for sealing electromagnetic waves An electromagnetic shielding gasket assembly includes a coil spring for blocking the propagation of electromagnetic waves therepast. The coil spring includes individal coils interconnected with one another and disposed in a canted relationship with a cent... | 01/07/1992 |
| 5076593 | Disc brake caliper seal A disc brake caliper seal arrangement wherein an annular seal is provided between the caliper housing and the outside diameter of the piston provided therein. The seal provides a rollback function which returns the piston to a given running clearance betw... | 12/31/1991 |
| 4768627 | Frictionless hydraulic damper and damper-snubber A frictionless hydraulic damper including a cylinder having end walls mounting the opposite ends of a shaft in bushings with a clearance, bellows seals between each end wall and the portions of the shaft extending beyond each end wall, a piston head on th... | 09/06/1988 |
| 4681327 | Compound seal with pressure equalization aperture A compound seal for affecting a seal on a translating shaft movable within a sleeve to separate high pressure and low pressure zones. The compound seal includes a sealing member and a clamping member disposed in a groove formed in one of the elements. The... | 07/21/1987 |
| 4645216 | Radially disposed sealing device for rotating members A bearing sealing device comprises a middle ring having peripheral channel adapted to partially accommodate an annular sealing means that exerts a sealing action against a rotating member to be protected, and against the inner surface of the encircling ca... | 02/24/1987 |
| 4633907 | Valve assemblies In a sealing arrangement for a rotary fluid pressure control valve, such as a power steering control valve, a resilient sealing ring is located in a ring groove for sealing engagement with an outer cylindrical member. Frictional losses and a tendency for ... | 01/06/1987 |
| 4582330 | Seal with cleft seating surface An annular or linear seal having a substantially K-shaped cross section. The seal with cleft seating surface provides a two-way pressure barrier when it is installed in a groove having a cross section of "sigma" shape, wherein the flat side of the K-shape... | 04/15/1986 |
| 4577870 | O-ring seal in channel with fluid pressure equalization means An apparatus to improve the sealing capabilities of a sealing member. The apparatus comprises a first member having a channel formed therein for receiving the sealing member in sealing engagement with the bottom of the channel. A second member forms a sec... | 03/25/1986 |
| 4541638 | Emergency shaft seal device by deformation of packing ring This invention discloses an emergency shaft seal device wherein a packing ring of elastic material the inside diameter of which is larger than the outside diameter of a rotatable shaft is received in an annular groove along the periphery of the rotatable ... | 09/17/1985 |
| 4524677 | Seals used in piston and cylinder arrangements The present specification relates to a piston and cylinder arrangement for use in a vehicle disc brake. Such arrangements are either hydraulically or pneumatically operable. In disc brakes the piston and cylinder of the brake actuator are usually sealed a... | 06/25/1985 |
| 4523765 | High pressure sealing means for longitudinally movable parts of deep-well drilling tools A high-pressure sealing means for two parts of deep-well drilling tools which are longitudinally movable in relation to one another consists of a wearing sealing ring (7) which is disposed in an annular groove in a first part (1) and bears against the sec... | 06/18/1985 |
| 4474382 | Unitized seal carrier assembly for reciprocating shaft An improved seal carrier assembly for use in the fluid end of a reciprocating pump.... | 10/02/1984 |
| 4422533 | Sealing means for hydraulic brake actuators A brake actuator comprises a piston working in a cylinder with a seal carried by the piston for engagement with the outermost wall of the cylinder and a seal housed in the innermost wall of the cylinder for engagement with the piston. Each seal is of tria... | 12/27/1983 |
| 4391184 | Diaphragm actuator A diaphragm actuator is operated by the pressure difference between a pressure chamber and a negative pressure chamber, and causes an operating shaft to slide through a wall portion of the negative pressure chamber. When the pressure in the negative press... | 07/05/1983 |
| 4387901 | Retraction seal for a disc brake with anti-nibbling feature A retraction seal (32) for a disc brake is disposed within a caliper groove (34). The retraction seal (32) cooperates with a forward wall (42) of the groove (34) to define a space (72) which substantially prevents the retraction seal (32) from engaging a ... | 06/14/1983 |
| 4372624 | Dynamic O-ring seal An O-ring shaft seal is disclosed to isolate a lubricated bearing from an external environment as utilized in a typical sealed bearing rotary rock bit. The O-ring is confined within a pair of symmetrical and complementry V-shaped surfaces, each surface ha... | 02/08/1983 |
| 4291890 | Valve seal with O-ring and backup ring A seal structure for use in high pressure pneumatic or hydraulic fluid actuators. A solid toroidal shaped elastomeric O-ring and a solid toroidal shaped backup ring are emplaced in a specially configured circumferential groove on an internal sleeve. A con... | 09/29/1981 |
| 4256314 | Sealing device for temporary pressure sealing A pressure seal for a rotating shaft (3) is disclosed in which a rubber sealing ring (9) is arranged in a trapezoidal slot (4), the sealing ring being made so thin at the slot opening as to prevent the rubber from creeping beyond the edges of the slot ope... | 03/17/1981 |
| 4252352 | Sealing ring A sealing ring for a rotary shaft is disclosed. The sealing ring has a planar frusto-conical configuration and is received in an obliquely slanted groove provided in either the rotary shaft or the bearing surface surrounding the shaft. The use of an obliq... | 02/24/1981 |
| 4228726 | Hydraulic disc brake piston seal An improved seal is disclosed for hydraulically sealing a piston-cylinder assembly used in activation of a floating caliper disc brake. The improved seal comprises an annular groove circumscribing the cylinder wall within which a ring type elastomeric sea... | 10/21/1980 |
| 4170363 | Oil scraper A scraper ring for removing oil from a piston rod is made of plastic and comprises conical surfaces defining a smallest diameter edge for contact with the piston rod. The ring is axially loaded with Belleville springs and a mating support ring bearing on ... | 10/09/1979 |
| 4156532 | Sealing device for an automobile disk brake A sealing device to be applied between a piston and a cylinder of a disk brake on an automobile. The sealing device comprises an annular seal groove provided in the inner surface of the cylinder and a seal ring inserted in the seal groove, the seal groove... | 05/29/1979 |
| 4109921 | Seal for pistons and piston rods of cylinder-type actuators An annular seal for pistons and piston rods of cylinder-type actuators, especially hydraulic actuators, where a first sealing ring of highly elastic material is received inside an annular groove in such a way that a sharp edge of the ring exerts an elevat... | 08/29/1978 |
