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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 |
| 7324040 | Method of automatically setting the gain of an interrogator receiver within a non-contacting identification system An attack is activated in a receiver amplifier of an interrogator whenever an amplified input signal exceeds an attack threshold voltage value Vatt, and the receiver amplifier at least during a waiting period, the length of which preferrably equals the double length... | 01/29/2008 |
| 7287523 | Thermally responsive regulator valve assembly A thermally responsive regulator valve assembly and exhaust gas recirculation system for an internal combustion engine having an intake manifold and an exhaust system is provided. The exhaust gas recirculation system includes an exhaust gas recirculation passage sel... | 10/30/2007 |
| 7210846 | Thermostat housing assembly A thermostat housing assembly (10, 100) includes a housing (12, 102) having a flange (16, 106) for mounting the housing (12, 102) on a support structure and a tubular spout (18, 108) extending from the flange (16, 106) and d... | 05/01/2007 |
| 7190143 | Pulse width modulation (PWM) rectifier with variable switching frequency A method for controlling a device including a plurality of switching devices operated in accordance with a pulse width modulation technique includes receiving a reference voltage signal associated with a first pair of the switching devices. A switching signal is gen... | 03/13/2007 |
| 7104461 | Pipe temperature control valve A control valve for preventing freezing in a pipe. A ball valve selectively biased against a valve seat is controlled by a bimetallic snap disk. The control valve is connected to one or more water pipes. When the temperature in the pipe or in the control valve is be... | 09/12/2006 |
| 6557592 | Bottle valve A bottle charged with a gaseous material intended to be discharged through a range of temperatures but not outside that range, has a valve through which the gaseous material is to be directed. The valve has at least a part wholly inside the bottle, which ... | 05/06/2003 |
| 6450412 | Temperature actuated flow restrictor A thermostat valve 10 is provided for controlling gas flow to an infrared catalytic heater 26. The thermostat valve includes a thermally responsive snap member 50, 64 positioned within a housing central flow path and moveable with respect to the housing b... | 09/17/2002 |
| 6431458 | Temperature actuated flow restrictor A thermostat valve 10 is provided for controlling gas flow to an infrared catalytic heater 26. The thermostat valve includes a thermally responsive snap member 50, 64, 150 positioned within a housing central flow path and moveable with respect to the hous... | 08/13/2002 |
| 6374848 | Automatic mechanism for cut-off and drainage of under low-freezing ambient temperature conditions An automatic mechanism is provided for cutting-off water flow to a plumbing system of a house, an apartment, a business or the like, while at the same time draining water/plumbing systems when subjected to low/freezing ambient temperatures. The mechanism ... | 04/23/2002 |
| 5831345 | Priority relay circuit with timer A priority control system is disclosed for controlling multiple secondary load devices, and one priority load device. The secondary load devices can be randomly controlled at any time, except when the priority load device is activated, in which case, all ... | 11/03/1998 |
| 5826790 | Temperature-sensitive shutoff valve A new temperature-sensitive valve for handling liquids includes a housing having a valve seat and a valving member mounted for movement from a flow-permitting first position spaced from the seat to a flow-blocking second position against the seat. A latch... | 10/27/1998 |
| 5685481 | Trip-free high limit control A trip-free high limit control for a water heater having a source of heat to heat the water. A switch arm is mounted in a control housing for movement in the housing. The switch arm has a first contact portion at one end thereof. A second stationary conta... | 11/11/1997 |
| 5488347 | Thermostat assembly with flanged disc cup A thermostat has a metal disc cup with a circular cup bottom wall and a cylindrical cup peripheral wall. An inclined flange extends outwardly from the cup peripheral wall. A body whose temperature is to be sensed has a blind hole therein with a closed bot... | 01/30/1996 |
| 5352416 | Valve arrangement for a sterilization container The valve arrangement for a sterilization container having a pressure chamber with vent openings, includes two valve bodies arranged in the pressure chamber above the vent openings. The valve bodies are controlled by temperature sensors. The temperature s... | 10/04/1994 |
| 5263643 | Thermally responsive relief valve A thermally responsive pressure relief valve using a bimetallic valve disc as a component. The bimetallic valve disc is used as a temperature sensitive valve seal. When temperatures go beyond the set point of the disc, it opens the valve with a snap actin... | 11/23/1993 |
| 5037061 | Valve construction and method of making the same A valve construction and method of making the same are provided, the valve construction comprising a housing provided with a chamber therein and with an inlet leading to the chamber and outlet leading from the chamber, a valve seat carried by the housing ... | 08/06/1991 |
| 5035512 | Oil-level sensing apparatus having a time delay function An oil level sensing apparatus has a body which defines a volume having an open bottom. A float in the volume supports a permanent magnet and moves within the volume in accordance with the oil level therein. A reed-switch is affected by the magnet support... | 07/30/1991 |
| 5011075 | Variable flow valve A fluid flow control device primarily intended for throttling the flow of liquid refrigerant between two flow rates. The device includes a disc which moves between two distinct positions with a snap action in response to changes in temperature of the refr... | 04/30/1991 |
| 4995553 | Thermally controlled valve There is provided a thermally controlled valve having a valve seat, a closure valve associated therewith, an expansion capsule containing an evaporation medium which actuates the closure valve by a stroke displaceable wall part, and a snap spring biasing ... | 02/26/1991 |
| 4958801 | Valve construction and method of making the same A valve construction and method of making the same are provided, the valve construction comprising a housing provided with a chamber therein and with an inlet leading to the chamber and outlet leading from the chamber, a valve seat carried by the housing ... | 09/25/1990 |
| 4955536 | Thermally controlled valve A thermally controlled valve is provided having a valve seat, a closure valve cooperating with the valve seat, a diaphragm capsule, a plate spring, and an abutment supporting the plate spring along its outer edge. The diaphragm capsule includes a rigid wa... | 09/11/1990 |
| 4917294 | Shut-off valve for scald prevention An assembly is provided for the prevention of scalding in showers and other such installations. The assembly includes a valve assembly within a mixed water supply line and a temperature sensitive element for controlling the operation of the valve assembly... | 04/17/1990 |
| 4878512 | Valve mechanism In a freeze protection-valve, a wax actuator is situated in a heat-conductive housing to which heat is conducted from the liquid system being protected. The housing prevents the actuator from triggering the valve to its opened condition while the liquid s... | 11/07/1989 |
| 4830277 | Thermostatic valve A thermoplastic valve includes a valve body having an open cavity therein and inlet and outlet passages which communicate with the cavity, a valve seat at the inner end of the outlet passage and a bimetallic disc in the cavity. The bimetallic disc has an ... | 05/16/1989 |
| 4821954 | Thermally activated snap-action valve A thermally activated snap-action valve includes a valve body having an interior cavity and inlet and outlet passages formed therein and a bimetallic disc, a ball element, and a resilient positioning plate in the cavity. The positioning plate is operative... | 04/18/1989 |
| 4775101 | Safety valve A safety valve for a fluid delivery system having a duct in which the safety valve is housed. The safety valve comprises a temperature sensitive means through which fluid passes, this temperature sensitive means being connected to a retaining means which ... | 10/04/1988 |
| 4748432 | Device for the automatic control of room temperature in existing automobiles A device for the control of room temperature in existing automobiles is placed in series with the driving circuit of the blower motor of the automobile. The temperature control device includes a bimetal or spiral bimetallic strip capable of setting a work... | 05/31/1988 |
| 4643352 | Temperature compensating vacuum delay valve For use in applying a vacuum to a choke pull-off assembly, a temperature compensating vacuum delay valve comprising a housing a first opening adapted to be connected to manifold vacuum and a second opening adapted to be connected to a choke pull-off assem... | 02/17/1987 |
| 4615482 | Multi-way fluid flow control valve A temperature-dependently actuated 3-port, 2-way valve 1 has a bimetallic disc 22 which closes either a valve seat 15, as shown, or a valve seat 14 when it snaps over into an upwardly domed position. The disc 22 is floatingly supported by two 3-legged spr... | 10/07/1986 |
| 4586653 | Discharge device for a condensate controlled by a bimetallic snap disc In a discharge device for a condensate operative within a given temperature range, and including a housing, a valve seat disposed in the housing, a closure part cooperating with the valve seat and subjected to an inlet pressure, a bimetallic snap disc car... | 05/06/1986 |
| 4580719 | Thermostatic control device The specification discloses a thermostatic control device for controlling the flow of a pressurized fluid. A housing having a plurality of flow-through apertures encloses a valve which is movable between a seated and an open position. The valve is operabl... | 04/08/1986 |
| 4574762 | Device for temperature responsive switching of overflow fuel quantities of a diesel fuel injection pump In a device for temperature responsive switching of overflow fuel quantities from a diesel fuel injection pump to a fuel supply tank or a filter of a fuel supply system a switching valve, arranged between the fuel injection pump and the tank, is actuated ... | 03/11/1986 |
| 4561588 | Bimetallically controlled steam trap A steam trap with a closure element or valve disposed on the low pressure side cooperating with a valve seat, the valve being actuated by a control unit disposed in the high pressure chamber of the steam trap. The control unit includes a plurality of bime... | 12/31/1985 |
| 4546919 | Ventilator actuator A ventilator actuator is provided for opening and closing a ventilator opening having a diaphragm secured to a closure member mounted for pivotal movement about an axis to form a reservoir for a heat responsive fluid between them, the diaphragm normally b... | 10/15/1985 |
| 4527733 | Check valve A thermostatic valve including a housing that defines a housing inlet and a housing outlet and a valve body having an end wall and a side wall that define a valve chamber within the housing. The end wall defines an annular valve seat and a valve inlet ope... | 07/09/1985 |
| 4515069 | Change-over diffuser A thermally powered change-over diffuser is disclosed which includes a housing having an outlet and movable blade assembly mounted with respect to the outlet for displacement between a first position producing a Coanda flow across a surface, such as a cei... | 05/07/1985 |
| 4460007 | Valve mechanism In a freeze protection valve, a wax actuator is situated in a heat-conductive housing to which heat is conducted from the liquid system being protected. The housing prevents the actuator from triggering the valve to its opened condition while the liquid s... | 07/17/1984 |
| 4460124 | Double throw valve An improved thermally actuated valve assembly having a double throw feature comprises three ports in which two passage routes are provided through the valve; one passage route connecting ports one and two and the other passage route connecting ports two a... | 07/17/1984 |
| 4458840 | Temperature responsive valve A temperature responsive valve includes a bimetal disk which snaps in response to changes in temperature, a rod moved by the snapping action of the bimetal disk, a valve member in association with movement of the rod to thereby control the flow of fluid, ... | 07/10/1984 |
| 4392608 | Thermally responsive fluid and electrical switch and control system A thermally responsive fluid and electrical switch particularly for use in an automotive engine control system has first and second housing means each with an open-ended well, the housing means being secured together so that the wells cooperate to form a ... | 07/12/1983 |
