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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 |
| 7415829 | Piston compressor A piston compressor comprises a piston (12) which oscillates in a cylinder (14). A compressed-gas supply arrangement is provided which comprises a compressed-gas accumulator (34), a compressed-gas supply line (18) between a compressed-gas... | 08/26/2008 |
| 6726459 | Variable injection rate high pressure fuel pump A high pressure fuel pump having a variable fuel injection rate, including a pump body, a pump cylinder formed in the pump body and a piston reciprocable within the pump cylinder, which defines a pressurization chamber. The pump piston has a reduced diameter portion... | 04/27/2004 |
| 6575716 | Linear compressor In a linear compressor having a compression mechanism for compressing and discharging a refrigerant, an inflammable refrigerant or a natural refrigerant such as propane, isobutane, carbon dioxide or the like is used as the refrigerant while no lubricating... | 06/10/2003 |
| 6016738 | Piston compressor of the horizontal type Piston compressor for compressing gas, comprising a frame with at least one cylinder which has an essentially horizontal axis, a piston which is reciprocable in the cylinder, a piston rod which at one end thereof is fixed to the piston, while the other en... | 01/25/2000 |
| 5970845 | Piston for a hydrostatic axial piston machine There is described a piston for an axial piston machine with which the skirt surface (12) of the piston shaft (15) has, at its forward end region (Y) which transforms into the piston end face (11) and/or at its rear end region (X) lying towards the piston... | 10/26/1999 |
| 5775306 | Advance mechanism An advance mechanism for a pump comprises a fluid operable piston arranged to have pressurized fluid applied to a first end thereof to adjust the axial position of the piston. The arrangement further comprises means for applying fluid under pressure to a ... | 07/07/1998 |
| 5050485 | Cushioning of piston sidethrust in gas lubricated engine Gas cushions are maintained between a piston and a cylinder of a gas lubricated reciprocating engine which are effective in retarding the approach of the piston to the cylinder wall under the thrust of side forces from the connecting rod. The cushion are ... | 09/24/1991 |
| 4926744 | Radial piston hydraulic machine with piston having twelve circumferential fluid bearing pockets A member oscillates on a face and another member pivots on a bed of the first member. Passages are provided through the members to lead a lubrication fluid under pressure into a fluid pocket between the mentioned face and one of the members. The fluid pre... | 05/22/1990 |
| 4846051 | Uncooled oilless internal combustion engine having uniform gas squeeze film lubrication An apparatus for providing a gas phase film lubrication between a reciprocal piston and a cylinder of an uncooled oilless internal combustion engine; the piston is effective to drive a rotary crankshaft in response to an expanding gas charge. The apparatu... | 07/11/1989 |
| 4719846 | Method and circumferential slider apparatus for balancing lateral force between piston and cylinder wall A pair of circumferential sliders are positioned symmetrically on opposite sides of a piston, an inner surface of each circumferential slider being connected to a respective bevel rack gear. The rack gears are driven by bevel pinion gears that are attache... | 01/19/1988 |
| 4644851 | Linear motor compressor with clearance seals and gas bearings A gas bearing system for a piston 24 of a linear compressor 20 in which gas from the piston head space 26 is injected into a high pressure reservoir 106 within the piston when the working fluid in the piston head space is at high pressure. In one embodime... | 02/24/1987 |
| 4581982 | Reciprocating piston internal combustion engine A reciprocating piston internal combustion engine comprises a piston movably disposed within an engine cylinder, the top surface of the piston defining thereon a combustion chamber; a space formed in the cylinder; a movable member disposed within the spac... | 04/15/1986 |
| 4545738 | Linear motor compressor with clearance seals and gas bearings A gas bearing system for a piston 24 of a linear compressor 20 in which gas from the piston head space 26 is injected into a high pressure reservoir 106 within the piston when the working fluid in the piston head space is at high pressure. In one embodime... | 10/08/1985 |
| 4294161 | Power steering gear with oil filled capillary balancing slots An integral power steering gear assembly includes a piston and cylinder combination having greater output efficiency through improved fluid balancing and cushioning of the piston at its ends. The improved cushioning utilizes oil capillary slots in lieu of... | 10/13/1981 |
| 4257313 | Power steering piston and cylinder combination with plastic wear surfaces Plastic wear strips are provided on a power steering piston or cylinder to improve the efficiency of translation movement of the piston in the cylinder during operation. The plastic surface of the strip, which is preferably on the piston, minimizes wear b... | 03/24/1981 |
| 4233886 | Sealing device for hydraulic piston mechanism A sealing device for a high pressure hydraulic piston mechanism in which the gap between the cylinder in which the piston is slideable to pressurize delivery fluid therein is sealed by sealing fluid drawn from a separate supply to that of the delivery flu... | 11/18/1980 |
| 4173881 | Rolling stand with hydraulic adjustment of the mill rolls A rolling stand with hydraulic adjustment of the mill rolls comprises a hydraulic cylinder whose piston is acted upon by the adjustment spindle and whose cylinder body, in turn, bears upon the block in which the back-up or pressure roll is journaled. The ... | 11/13/1979 |
| 4124978 | Compressed air engine A compressed air engine having specially designed cylinder heads and piston configurations in order to reduce friction and maximize the application of air from a pressurized air source. The disclosure includes a lubrication system whereby the mechanical p... | 11/14/1978 |
| 4111104 | Engine with low friction piston Engine piston arrangements including at least one friction reducing gas bearing recess in a thrust loaded portion of the piston skirt and connected to the space between the top two piston rings to provide blowby gas to pressurize the bearing recess and su... | 09/05/1978 |
| 4088063 | Power steering gear with short piston and fluid bearings An integral power steering gear with a valve in the piston is provided having a short piston and cylinder to conserve space and weight. The input shaft is mounted on a bearing carried by an inwardly projecting annular portion on the bearing cap. The proje... | 05/09/1978 |
| 4050360 | Oil damped piston An improved oil damped piston for use in internal combustion engines, pumps, compressors, or the like. The piston includes a generally cylindrical piston body having a crown and a depending skirt. A pair of spaced bands of polytetrafluoroethylene are carr... | 09/27/1977 |
| 3974745 | Piston for compressor A piston for a compressor having at both ends a step-down portion which defines an annular cavity when the piston is mounted in the cylinder, the said cavity being very thin while its length is dependent on the weight and the length of the piston. A rider... | 08/17/1976 |
