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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 |
| 7273026 | Roller follower body The present invention relates to a roller follower, comprising an outer surface, enclosing a first cavity, a second cavity, and a transition opening, wherein the first cavity includes a first inner surface configured to house a cylindrical insert the second cavity i... | 09/25/2007 |
| 7246584 | Force-transmitting arrangement for a valve train of an internal-combustion engine A force-transmitting arrangement (4) for a valve train (1) of an internal-combustion engine (2) is provided with hydraulic valve play compensation device (6) with a hollow cylindrical compensation piston (13). This borders, on one ... | 07/24/2007 |
| 7237520 | Hydraulic valve-lash-adjusting element (HVA) A hydraulic valve-lash-adjusting element (HVA) for the valve train of an internal combustion engine, wherein: a housing (1) has a blind bore (2) in which a piston (3) is guided with sealing clearance and is in ... | 07/03/2007 |
| 6990935 | Pivoting lifter control system using spool valve and check valve to recirculate oil An internal combustion engine that has a camshaft having a plurality of cam lobes, a plurality of valves where each of the valves are actuated by a lifter actuated by the camshaft with a cam lobe. The lifter comprises a lifter body having an upper surface and a lowe... | 01/31/2006 |
| 6901328 | Method and arrangement for detecting the end of a start operation in an internal combustion engine of a motor vehicle A method and an arrangement for detecting the end of a start operation in an internal combustion engine (1) of a motor vehicle make it possible to distinguish the start operation from a steady-state condition of the engine (1) even for starters having ... | 05/31/2005 |
| 6748914 | Refillable metering valve for hydraulic valve lifters Oil metering valve means in a hydraulic valve lifter configured such that a metering plate cooperates with a pushrod seat to meter the flow of oil in a forward direction. The metering means is also conducive to the flow of oil in the reverse direction, permitting an... | 06/15/2004 |
| 6510825 | Internal combustion engine for motor vehicles and the like An internal combustion engine comprising at least one intake valve and/or exhaust valve moving axially between a closed position and a position of maximum opening and means for moving the valves adapted to move, on command, this valve between the closed p... | 01/28/2003 |
| 6481395 | Device for actuating a gas exchange valve In a device for actuating a gas exchange valve for internal combustion engines, having at least one compensating element which is arranged in the force path of an actuating element of the gas exchange valve and which has a pressure space which is formed b... | 11/19/2002 |
| 5086738 | Motor brake for air-compressing internal combustion engines A motor brake for an air-compressing internal combustion engine is provided. A hydraulic linkage system is disposed between a cam and an exhaust valve, and communicates via a connecting line with a high-speed solenoid valve and a linkage oil compensating ... | 02/11/1992 |
| 5007388 | Hydraulic valve lifter A hydraulic valve lifter is disclosed which does not require a source of pressurized lubricating fluid, and is particularly suitable for engines using a splash lubrication system. The engine crankcase oil is transferred from the cam surface through a chec... | 04/16/1991 |
| 5005541 | Hydraulic valve lifter A hydraulic valve lifter for use in an internal combustion engine, comprises an inverted cup-like body, an inverted cup-like plunger housed within the body, a high pressure chamber defined between the body and the plunger, and an oil passage through which... | 04/09/1991 |
| 4802448 | Cup tappet with hydraulic play compensation device A cup tappet is disclosed which has a hydraulic play compensation device for a breather valve of an internal-combustion engine. The play compensation device includes a play compensating element which is composed of components of the cup and of the valve s... | 02/07/1989 |
| 4796573 | Hydraulic engine valve lifter assembly Hydraulic engine valve lifter includes a pair of pistons defining a pressure chamber therebetween and a separate lash adjusting piston which defines a lash adjustment chamber with one of the pistons in the pair. One-way valve structures permit fluid to fl... | 01/10/1989 |
| 4782799 | Self-adjusting hydraulic valve tappet A self-adjusting hydraulic valve tappet arranged in a guide bore of a cylinder head of an internal combustion engine and being contacted at one end face of the valve tappet by a cam and bearing with a second end face against the end of a valve stem, the t... | 11/08/1988 |
| 4762100 | Inverted bucket tappet with improved seal and valve stem pad A self-contained lash adjuster includes a generally cup-shaped follower having an end face and a lash adjuster cartridge assembly positioned within the follower. The cartridge assembly includes a body positioned against the follower end face and a recipro... | 08/09/1988 |
| 4662324 | Oleodynamic valve, particularly for a hydraulic tappet In a hydraulic tappet including two cups slidable one within the other, of which the outer one cooperates with the surface of the cam of the camshaft through an adjustment disc while the inner one bears on the end of the valve stem, an expansion chamber i... | 05/05/1987 |
| 4530320 | Self adjusting hydraulic tappet for heat engines The tappet of the invention includes two movable elements defining between them a chamber which can be filled with oil arriving through at least one suitable duct from a source of oil under pressure; along this duct there is disposed an interception membe... | 07/23/1985 |
| 4475490 | Hydraulic valve lifter The present invention proposes a hydraulic valve lifter used in an internal combustion engine. The valve lifter has a body consisting of a hollow cylindrical portion accommodating a cylindrical plunger and a lower end portion engaging with a cam controlli... | 10/09/1984 |
| 4463713 | Hydraulic tappet with automatic taking up of the clearance for endothermic engines Hydraulic tappet comprising a first and a second body shaped as a socket defining between them a chamber suited to be filled with a fluid coming from a source through an appropriate duct formed in the said socket bodies; along the said duct is arranged a ... | 08/07/1984 |
| 4437439 | Valve tappet A valve tappet for internal combustion engines with an overhead cam shaft moveably mounted in the sliding guide directly between the cam and valve stem and which is desinged as an automatic play compensating element comprising an outer part and an inner p... | 03/20/1984 |
| 4424774 | Self adjusting hydraulic tappet for heat engines The tappet of the invention includes two movable elements defining between them a chamber which can be filled with oil arriving through at least one suitable duct from a source of oil under pressure; along this duct there is disposed an interception membe... | 01/10/1984 |
| 4279226 | Hydraulic tappet for an internal combustion engine having an overhead camshaft An automatic hydraulic tappet for taking up clearance between a cam and a valve stem in an internal combustion engine with an overhead camshaft can rapidly attain its optimum operational efficiency when the engine is started, since the supply conduit, whi... | 07/21/1981 |
| 4098240 | Valve gear and lash adjustment means for same Valve gear of preferably cam-over-rocker type for an internal combustion engine including a hydraulic lash adjustment means and in which the rocker is pivoted at one end on a stationary hydraulic adjuster. The lash adjuster operates from oil received unde... | 07/04/1978 |
| 4054109 | Engine with variable valve overlap Variable overlap of the intake and exhaust valve opening periods for an internal combustion engine is obtained by providing a speed responsive yieldable link in the valve actuating mechanism that varies the effective valve lift with engine speed. The vari... | 10/18/1977 |
| 4020806 | Hydraulic valve lifter for internal combustion engine A hydraulic valve lifter for an automotive internal combustion engine, having a lifter cylinder formed with a first cylinder chamber contractable in response to a force exerted on the lifter from the cam on the engine camshaft and a second cylinder chambe... | 05/03/1977 |
| 3967602 | Hydraulic valve lifter for reciprocating internal combustion engines A hydraulic valve lifter for a reciprocating internal combustion engine has a displaceable plunger within a body for coupling a cam lobe with a push rod in a valve train. The cam lobe acts on the base of the body. A cavity within the plunger receives oil ... | 07/06/1976 |
