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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 |
| 7610936 | Flow based pressure isolation mechanism for a fluid delivery system The fluid delivery system includes a pressurizing device for delivering a pressurized injection fluid, a low pressure fluid delivery system, and a pressure isolation mechanism adapted for fluid communication with the pressurizing device and low pressure fluid delive... | 11/03/2009 |
| 7311116 | Gas regulation system and process for operating the gas regulation system A gas regulation system includes a manifold, a plurality of control modules in fluid communication with the manifold, and a power source. Each control module includes an actuatable valve that is in fluid communication with an associated gas storage device and in ele... | 12/25/2007 |
| 7252117 | Reusable stub-out cover A stub-out cover for protecting the outer surface of a stub-out line. The stub-out cover includes a substantially rigid, molded tubular member open at one end and closed at the other end. A plurality of flexible tab members extend from the inner wall of the tubular ... | 08/07/2007 |
| 7156326 | Water sprayer with water-spraying adjustment mechanism A water sprayer with a water spraying adjustment mechanism including a body and a rotatable cap is disclosed. The body includes an outer tubular wall with a threaded outer surface forming a central axial bore extrusion defining an inner chamber, an inner tubular wal... | 01/02/2007 |
| 7044165 | Outflow regulator for a gravity-fed liquid outlet An outflow regulator for a gravity-fed liquid outlet of a liquid reservoir comprising a restriction plate mountable within the liquid outlet for limiting a flow rate of an effluent. The restriction plate allows a lower passage for the effluent when a first level of ... | 05/16/2006 |
| 7018337 | Method and apparatus for automatic non-invasive blood pressure monitoring An automatic non-invasive blood pressure monitoring system includes a blood pressure monitor, a blood pressure cuff pneumatically connected to the blood pressure monitor, a deflation valve connected intermediate the blood pressure monitor and the blood pressure cuff... | 03/28/2006 |
| 7004200 | Constant flow valve for a water softener control assembly A flow control valve controls a flow of water through a passage to a brine tank of a water treatment apparatus. A valve seat is between first and second sections of the passage. The valve seat has a first end with a concave surface facing the first section and an ap... | 02/28/2006 |
| 6766829 | Valve assembly for gas cylinder Within a housing (3), a gas inlet (4) communicates with a gas outlet (5) through an inlet passage (11), a shut off valve (12) and an outlet passage (13), and a charging port (6) communicates with a discharging port ( | 07/27/2004 |
| 6341624 | Valve for cryogenic fluid A valve for cryogenic fluids that divides incoming fluid into separate outlets. The valve prevents the inadvertent leakage or reverse flow of fluid through the valve using a swing-type check valve, and may also remove undesirable debris from the fluid. Th... | 01/29/2002 |
| 5640997 | Relief valve for gas flow rate regulator An improved rotor retainer housing for a rotatable rotor body and a relief sealing mechanism for a gas flow rate regulator. The retainer housing having structural features equivalent to the essential corresponding features of a conventional metal part is ... | 06/24/1997 |
| 5365975 | Constant air pressure unit for air handling system A constant air pressure unit for an air handling system. The unit comprises a housing having an air inlet opening for admitting pressurized air into the housing. The housing has a top wall with a by-pass opening therein and a door is displaceably retained... | 11/22/1994 |
| 4998562 | Flow control valve A flow control valve to regulate the bleed flow rate of a pressurized vessel at one of only two available bleed flow rates. The flow control valve comprises an axial main gas flow passageway with an integral check valve that allows pressurization of the v... | 03/12/1991 |
| 4913260 | Gas silencing system with controlling sound attenuation A gas silencing system for controlled sound attenuation of the exhaust gas in a motor vehicle comprises a sound attenuation muffler for exhaust gases. The system also includes means providing a bypass passage for gas to flow around at least part of the mu... | 04/03/1990 |
| 4749005 | Combined gas pressure regulator and shut off valve A gas stove (A) includes a combined pressure regulator and manual shut off valve (C) which has an inlet (46) connected with a source (B) of natural gas. The combined valve includes a pressure regulator (60) in fluid communication with the inlet through a ... | 06/07/1988 |
| 4744391 | Flow control valve A flow control valve operable to bleed pressure from a pressurized source. The flow control valve includes an integral body, a bleed cap, a bleed valve element and a check valve assembly formed of a valve housing and a valve element.... | 05/17/1988 |
| 4700748 | Pressure-referenced programmed flow control in a hydraulic valve The point at which pump out pressure exceeds load is sensed to provide a point for scheduling flow to an actuator in a hydraulic system. Flow is controlled by a stepper motor (28) that moves a flow control valve (27). The steps needed to achieve fixed flo... | 10/20/1987 |
| 4692253 | Method and apparatus for removing extraneous matters Method and apparatus for removing extraneous matters from cooling water used in a tubular heat exchanger such as a condensor is disclosed. When a pressure difference between the portions upstream and downstream of a filter element exceeds a predetermined ... | 09/08/1987 |
| 4690171 | Valve assembly for a sphygmomanometer A valve assembly for a sphygmomanometer controls the inflation and deflation of a pressure cuff. The valve assembly includes an inlet connectable to a fluid pressure source such as a bellows, an outlet which is connectable to a blood pressure cuff, an inl... | 09/01/1987 |
| 4664155 | Apparatus for centralized pressurization and depressurization of aircraft hydraulic reservoirs A single manifold assembly is located in an easily accessible hydraulic servicing bay. The assembly includes a manifold (2) with an inlet port (4) having an integral check valve (8). A plurality of branch conduits (18), one for each reservoir, communicate... | 05/12/1987 |
| 4585623 | Device for performing quantitative chemical and immunochemical assays The invention provides a device for performing chemical or immunochemical assays quickly and on site. The device comprises a plastic molded body which may be miniaturized. The device is provided with a plurality of tubes for containing assay reagents, a s... | 04/29/1986 |
| 4516594 | Multi-part valve with a valve seat skeleton and cast valve body A multi-port valve comprises a valve seat skeleton and a valve body of readily castible material cast about the skeleton. The valve seat skeleton comprises a plurality of wear-resistant members each having a wear-resistant operative surface formed thereon... | 05/14/1985 |
| 4489757 | Electrically actuated servocontrol system for a static pressure operated load An electrically actuated servocontrol system for a static pressure-operated load is connected to a supply of hydraulic fluid under pressure. The supply has an outlet port and a return port. A relief means is connected across the supply port for maintainin... | 12/25/1984 |
| 4391321 | Heat exchanger in plants for ventilating rooms or buildings A heat exchanger in combination with two duct system for bringing in relatively cold outside air into an enclosure while exhausting relatively warm room air from the enclosure. The heat exchanger is positioned so as to recover heat from the exhaust air in... | 07/05/1983 |
| 4353243 | Flexible diaphragm controlled valve A multiport flexible diaphragm controlled valve is disclosed. The parts are all interconnected by low dead volume channels. The valve provides extremely fast response times, no moving parts other than the control diaphragm, operability over a wide range o... | 10/12/1982 |
| 4272021 | Pipeline drain apparatus A pipeline having a plurality of outlets spaced along its length is connected to a controllable supply of liquid under pressure. A transversely expandable and collapsible bladder is fixed in position within the pipeline interior and extends along its leng... | 06/09/1981 |
| 4195777 | Hot water heating system An improved hot water heating system used with an internal combustion engine is disclosed. This system provides a hot water flow control arrangement in which hot water supplied to a heating radiator is controlled by a valve and a pressure responsive bypas... | 04/01/1980 |
| 4172471 | Valve unit In a non-drip valve for a fluid flow line having a vacuum unit comprising supply chamber, a discharge chamber and a vacuum chamber connected to the discharge chamber to withdraw fluid therefrom when the forward flow is arrested, an improved control valve ... | 10/30/1979 |
| 4134428 | Non-drip valve In a non-drip valve for a fluid-flow line having a supply chamber, a discharge chamber and a vacuum chamber connected to the discharge chamber to withdraw fluid therefrom when the forward flow is arrested, pressure-responsive valve means controlling the f... | 01/16/1979 |
| 4100940 | Trickle emitter for subterranean irrigation An irrigation pipeline has a plurality of emitters equipped with discharge nipples for engagement by flexible hoses to release water at a trickle rate at selected subterranean locations within the radii of the hoses. A plurality of the nipples may be inte... | 07/18/1978 |
| 4073312 | Charge and relief valve A dual valve assembly having a charge and relief valve, comprising a unitary valve structure including a thick central body section and, extending therefrom, a pair of elongated hollow cylindrical valve members. A valve core is threaded into the bore of e... | 02/14/1978 |
| 4011662 | Automatic valve assembly and heater/humidifier converter for clothes dryer Automatic valve assembly connected to outlet from clothes dryer to selectively add heat and humidity to building. Bifurcated exhaust duct assembly has manual valve and filter in first duct to exhaust into building, and automatic valve in second duct to ex... | 03/15/1977 |
