Famous Patents
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.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7631739 | Dual wet clutch with an electric machine A dual clutch for a transmission with a first transmission input shaft and a second transmission input shaft that is positioned in coaxial relation to the first transmission input shaft. The dual clutch comprises a clutch portion comprising a hollow cylinder portion... | 12/15/2009 |
| 7614487 | Frictional engagement apparatus A frictional engagement apparatus is provided. The frictional engagement apparatus includes a first frictional engagement unit, a second frictional engagement unit disposed axially spaced from the first frictional engagement unit, and one case that supports the firs... | 11/10/2009 |
| 7600624 | Power transmission apparatus A power transmission apparatus has an input member rotated by an engine output. First and second clutch sections, respectively, have a plurality of driving clutch discs and a plurality of driven clutch discs. Each driving and driven clutch disc being alternately arr... | 10/13/2009 |
| 7523819 | Apparatus for controlling two friction clutches of a vehicle transmission An arrangement for controlling engagement and disengagement of two dry plate friction clutches (5,8) in a transmission having two concentric input shafts (3,6) comprising one release bearing (22,23) for each clutch on the transmission side of th... | 04/28/2009 |
| 7478718 | Wet clutch, in particular DCT clutch Wet clutch (1), in particular DCT clutch, comprising: at least one clutch pack (2, 3) including: a plurality of steel plates (4, 5), and a plurality of friction plates (6, 7) being disposed between t... | 01/20/2009 |
| 7395736 | All-wheel drive torque vectoring system An all-wheel drive system for a vehicle having an engine and a drive shaft is arranged between the drive shaft and front and rear propellable shafts. These shafts are interconnected by first and second clutches respectively, and the propellable shafts are coupled to... | 07/08/2008 |
| 7350635 | Hydraulic double clutch Hydraulic double clutch is provided that includes fluidically interconnected balancing chambers that are associated with a first and a second clutch piston. ... | 04/01/2008 |
| 7350633 | Apply piston for a power transmission An apply piston for a torque-transmitting mechanism in a power transmission includes a first circumferential periphery and a second circumferential periphery radially inward of the first circumferential periphery and axially displaced therefrom. The apply piston has... | 04/01/2008 |
| 7322455 | Torque transmitting unit A torque transmitting unit in the power train of a motor vehicle for transmitting torque between a drive unit having an output shaft and a transmission having at least one input shaft. At least one clutch unit is positioned between the drive unit and the transmissio... | 01/29/2008 |
| 7318512 | Dual clutch transmission with radially nested clutches having a common disk carrier A dual clutch transmission having radially nested clutches includes an outer clutch having a plurality of first outer clutch disks, a plurality of first inner clutch disks, and a first inner support carrier, with the first inner clutch disks operatively mounted to t... | 01/15/2008 |
| 7272985 | Transmission device of layshaft type A countershaft-type transmission device has an input central shaft and an input hollow shaft and two powershift elements. One first half of the powershift elements is in connection with one drive unit and a second half of the powershift elements is connected with th... | 09/25/2007 |
| 7264101 | Start-up clutch and torsional-vibration damper assembly A start-up clutch and torsional-vibration damper assembly including a disk clutch having an outer disk carrier and an inner disk carrier, and a torsional vibration damper having a primary element, a secondary element, and a spring dampening mechanism. The spring dam... | 09/04/2007 |
| 7231845 | Cone selector and associated transmission assembly A multi cone selector in a transmission employs sandwiched cone friction surfaces 19A, 20A and 21A and these are shown in free or unengaged state while the corresponding friction surfaces as numerals 19, 20 and 21 are shown as enga... | 06/19/2007 |
| 7147095 | Gearshift transmission for a motor vehicle with hydraulically actuated multiple clutch A gearshift mechanism for a motor vehicle with hydraulically actuated multiple clutch, particularly a twin clutch, has a first gear input shaft to drive a first group of gears and a second gear input shaft to drive a second group of gears. The two gear input shafts ... | 12/12/2006 |
| 7124867 | Traveling transmission of working vehicle In a traveling transmission in which an auxiliary transmission is interposed between a main clutch and a mechanical transmission, the auxiliary transmission is configured such that power transmission is cut out interlockingly with the disengagement operation of the ... | 10/24/2006 |
| 7121389 | Oil system The invention relates to an improved system for supplying filtered oil to wet brakes of the tractor without additional/auxiliary pump. The system comprises of a suitably sized connection provided on the drain line of the Hydraulic system, which supplies required qua... | 10/17/2006 |
| 7121392 | Hydraulic double clutch A hydraulic double clutch for a transmission with two coaxially arranged input shafts, a driven clutch housing and two hydraulically actuated clutches with friction disks and annular actuating pistons. The first clutch connects the clutch housing to the first input ... | 10/17/2006 |
| 7080722 | Multiple clutch system, particularly a double clutch system A multiple clutch system, particularly a double clutch system, includes a housing arrangement connectable to a drive element and rotatable therewith about an axis of rotation. The clutch system include a first coupling area and a second coupling area. The first coup... | 07/25/2006 |
| 7070532 | Planetary transmission having a rotating-type torque-transmitting mechanism with a stationary piston A planetary transmission has a plurality of rotating-type torque-transmitting mechanism that are operable to connect a rotating input mechanism with one or more planetary gear members. At least two of the rotating-type torque-transmitting mechanisms are radially sta... | 07/04/2006 |
| 7021422 | Clutch system A clutch system includes a clutch arrangement between a drive unit and a transmission, a pump arrangement which supplies pressure medium to the clutch arrangement at a pressure and rate of flow, and an operating medium supply arrangement which supplies an operating ... | 04/04/2006 |
| 7011199 | Tandem frictional engagement device and automatic transmission mounted therewith A friction disc in a tandem frictional engagement device, that is spline-fitted to a first coupling members is pressed by a first piston in a first direction, wherein the friction disc and another friction disc on the side of a first coupled member are clamped betwe... | 03/14/2006 |
| 6976568 | Clutch arrangement in a transmission having two axially and radially adjacent clutches A clutch arrangement in a transmission, particularly in an automatic transmission or automated selector transmission in the design of a double clutch transmission, having two axially and radially adjacent multi-disc clutches (B, E) in which an inner discs (23... | 12/20/2005 |
| 6949042 | Shiftable transmission A shiftable transmission in which at least two clutches (2, 7) actuated in closing direction by spring force and in opening direction by the exertion of pressure are arranged, wherein output of the transmission is stopped by unpressurized shifting of both act... | 09/27/2005 |
| 6929107 | Dual clutch for a transmission with two input shafts The invention relates to a hydraulic twin clutch for a transmission with two transmission input shafts, preferably for a power-shift transmission in motor vehicles, with concentric arrangement of the two transmission input shafts, a driven clutch housing, two hydrau... | 08/16/2005 |
| 6889811 | Hydraulically operated clutch system A clutch system includes a clutch device for positioning in a drive train between a drive unit and a transmission, and an actuating unit for hydraulically actuating the clutch device by means of at least one hydraulic slave-cylinder. The actuating unit has a hydraul... | 05/10/2005 |
| 6827191 | Clutch system with at least one multiple-plate clutch arrangement A control unit associated with the cooling fluid supply switches the flow of cooling fluid on or off by controlling the cooling fluid supply in the course of a respective shifting process in which the transmission is shifted up from a lower gear to a higher gear or ... | 12/07/2004 |
| 6808054 | Torque transfer device The invention relates to a torque transmission device comprising a first and at least one second coupling device, of which each can be switched into different switching positions The torque transmission device also comprises a drive device, an actuating device and a... | 10/26/2004 |
| 6786317 | Hydraulic clutch assembly A hydraulic clutch assembly is equipped with a spring-drive hydraulic clutch, which includes a gear rotatably mounted on a transmission shaft and a clutch cylinder fixedly mounted on the transmission shaft, first and second friction elements respectively supported o... | 09/07/2004 |
| 6679132 | Transmission A transmission includes a first shaft, a first rotational member coaxial with the first shaft for unitarily rotating with the first shaft, a first gear positioned to rotate relative to the first shaft, a first clutch mechanism for engaging and disengaging... | 01/20/2004 |
| 6622839 | Multiple clutch arrangement A multiple clutch arrangement includes a drive member, first and second output members, a first clutch arrangement for selective activation of a first torque transmission path between the drive member and the first output member, and a second clutch arran... | 09/23/2003 |
| 6581744 | Transmission system in working vehicles In a front housing (1) including at a front end portion thereof an engine flywheel (6), there are provided a primary drive shaft (8) which is co-axial with the flywheel, a transmission shaft (11) which is parallel to the drive shaft, and an output shaft (... | 06/24/2003 |
| 6499578 | Multiple-clutch device The invention is directed to a multiple-clutch device, such as a double-clutch device, for arranging in a drivetrain of a motor vehicle between a drive unit and a transmission, wherein the clutch device has a first clutch arrangement associated with a fir... | 12/31/2002 |
| 6491149 | Multiple-clutch device The invention is directed to a multiple-clutch device, such as a double-clutch device, for arranging in a drivetrain of a motor vehicle between a drive unit and a transmission, wherein the clutch device has a first clutch arrangement associated with a fir... | 12/10/2002 |
| 6488138 | Multi-disk clutch in a power split transmission Multi-disk clutch connected downstream of a power split transmission consisting of a double clutch whose individual clutches rotate in opposite directions, the rotational-speed dependent axial forces being compensated on the shift piston, and has a valve ... | 12/03/2002 |
| 6471026 | Multiple-clutch device A multiple-clutch device, possibly a double-clutch device, for arranging in a drivetrain of a motor vehicle between a drive unit and a transmission. the clutch device has a first clutch arrangement associated with a first transmission input shaft of the t... | 10/29/2002 |
| 6464059 | Multiple-clutch device The invention is directed to a multiple-clutch device, such as a double-clutch device, for arranging in a drivetrain of a motor vehicle between a drive unit and a transmission, wherein the clutch device has a first clutch arrangement associated with a fir... | 10/15/2002 |
| 6401894 | Multiple-clutch assembly A multiple-clutch assembly includes a housing and a first clutch having a first drive member rotatably supported within the housing on a drive hub and a first driven member rotatably supported within the housing on a first driven shaft. A first clutch pac... | 06/11/2002 |
| 6305517 | Locating ring and groove configuration for use with axially stacked torque transmitting mechanisms in a power transmission A power transmission has axially aligned torque transmitting mechanisms. Each torque transmitting mechanism has a backing plate slidably disposed on a spline formed in the housing of the power transmission. Each backing plate has a locating ring to limit ... | 10/23/2001 |
| 6206161 | Selectively engageable torque transmitting mechanism with a one-way screw apply A fluid operated selectively engageable torque transmitter has a fluid operated piston that is pressurized to initiate engagement of a plurality of friction plates. The plates are alternately splined to an input member and an output member. One of the inp... | 03/27/2001 |
| 6199653 | Four-wheel driven vehicle A four-wheel driven wheel has a rear-wheel driving system branching at the intermediate thereof into a front-wheel driving system comprising a first transmission for driving the front wheels at a peripheral speed substantially identical with that of the r... | 03/13/2001 |
