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| Number | Title | Issue Date |
| 7175383 | Regenerative fluid pump and stator for the same A regenerative fluid pump (10) comprises a rotor having rotor blades for compressing fluid on two fluid flow paths, the first of which extends between a first pump inlet (12a) and a first pump outlet (14a), and a second of which ex... | 02/13/2007 |
| 7165458 | Vacuum gauge A thermal conductivity type pressure gauge comprises a gauge head (2) being rotatably mountable in a vessel whose environmental pressure is to be measured and an elongate electrical filament (6) mounted in the gauge head, the gauge head (2) havi... | 01/23/2007 |
| 7163036 | Method of supplying fluorine In a method of delivering high purity fluorine to a processing system, an on-site fluorine generator supplies high purity fluorine to a fixed storage tank, from which the high purity fluorine is supplied to the processing system. To provide a back up to the fluorine... | 01/16/2007 |
| 7147732 | Quenching method and apparatus A hot object is quenched after heat treatment. A hot gas stream having at least 20% by volume of hydrogen is taken from for example a carburising chamber of a furnace. The gas is cooled by passage through a heat exchanger, and is compressed in a compressor. The comp... | 12/12/2006 |
| 7137274 | System for liquefying or freezing xenon Apparatus for producing liquid or solid xenon comprises a duct 12 having an inlet 14 for receiving gaseous xenon and an outlet 16 for outputting gaseous xenon at a reduced temperature to a nozzle located in a vacuum chamber 60. A housing ... | 11/21/2006 |
| 7127915 | Nitrogen rejection method and apparatus Nitrogen is rejected from a pressurised feed gas stream comprising methane and nitrogen by cooling the feed gas stream in a main heat exchanger 10 and rectifying the cooled feed gas stream in a double rectification column 20 comprising a higher pressur... | 10/31/2006 |
| 7094036 | Vacuum pumping system A vacuum pumping system comprises a first gas supply for supplying a first gas, such as xenon, to a vacuum chamber. A pump receives the gas output from the chamber. A second gas supply supplies a purge gas, such as nitrogen or helium, for pumping with the first gas.... | 08/22/2006 |
| 7067759 | Metal working A method of working metal in which molten metal particles are ejected from, for example, a welding electrode or from a metal workpiece being cut or drilled. The ejected molten metal particles are caused to pass through a contact region in which they make contact wit... | 06/27/2006 |
| 6942466 | Mechanical pumps A mechanical pump having an inlet and spaced therefrom an outlet for the passage of fluid therethrough and incorporating at least one flame arrester. ... | 09/13/2005 |
| 6935364 | Magnetically-operated relief valves A valve comprising a housing having an inlet and spaced therefrom an outlet, a passageway extending between the inlet and the outlet, and a mechanism located in the passageway for controlling the flow of a fluid between the inlet and the outlet, the mechanism includ... | 08/30/2005 |
| 6919059 | Process and apparatus for recovering sulphur from a gas stream containing sulphide Oxygen or oxygen-enriched air is employed to support combustion in furnaces (16) and (26) of part of the hydrogen sulphide content of a first feed gas stream. Sulphur vapour is extracted in condenser (32) from the resulting gas mixture so as to ... | 07/19/2005 |
| 6916162 | Scroll compressor A scroll compressor which comprises a scroll assembly comprising two scroll walls, and a drive for causing a relative orbiting motion between the scroll walls for compressing fluid on two fluid flow paths between an inlet and an exhaust of the scroll assembly. A fir... | 07/12/2005 |
| 6893620 | Process and apparatus for recovering sulphur from a gas stream containing hydrogen sulphide Oxygen or oxygen-enriched air is employed to support combustion in furnace (16) of part of the hydrogen sulphide content of a first feed gas stream. Sulphur is extracted from the resulting gas stream in a sulphur condenser (26). Catalyst Claus reaction... | 05/17/2005 |
| 6863493 | Lubricating systems for regenerative vacuum pumps In a vacuum pump of the regenerative type or including a regenerative section in which a rotatable vertical shaft is supported by upper and lower bearings, a lubricating system for lubricating the upper bearing comprising an axial bore extending along the shaft and ... | 03/08/2005 |
| 6860365 | Lubrication system for rotating machines and pumps A system for lubricating the upper bearing supporting a rotatable vertical shaft in a machine or pump comprising an axial bore extending along substantially the length of the shaft and communicating at its lower open end with a reservoir containing lubricating fluid... | 03/01/2005 |
| 6857857 | Reciprocating machines A reciprocating machine such as a vacuum pump includes a cylinder in which a reciprocating piston is disposed for reciprocating movement. A variable voltage driver is provided for driving the piston and a vibration sensor is provided for sensing contact between the ... | 02/22/2005 |
| 6837071 | Nitrogen rejection method and apparatus Nitrogen is rejected from a feed gas stream comprising methane and nitrogen so as to form a methane product. The feed gas is separated in a double rectification column comprising a higher pressure rectification column 14, a lower pressure rectification column 16, an... | 01/04/2005 |
| 6708984 | Seal assemblies A seal assembly comprising a main O-ring seal element for engaging in a fluid tight manner opposed surfaces of two objects to be sealingly connected together and a barrier element positioned to protect all or a substantial portion of the surface of the main O-ring s... | 03/23/2004 |
| 6709228 | Vacuum pumps A compound vacuum pump comprising at least one turbo-molecular stage and downstream therefrom a multi-channel molecular drag stage, a first inlet through which fluid can pass through the turbo-molecular stage and the molecular drag stage towards a pump outlet, a sec... | 03/23/2004 |
| 6672855 | Vacuum pumps A vacuum pump having a screw mechanism and comprising two externally threaded rotors mounted on respective shafts in a pump body and adapted for counter-rotation therein with intermeshing of the rotor threads with close tolerances between the threads and ... | 01/06/2004 |
| 6637239 | Nitrogen rejection method and apparatus Nitrogen is rejected from a feed gas stream comprising methane and nitrogen so as to form a methane product. The feed gas stream is cooled in a main heat exchanger and is rectified in a double rectification column comprising a higher pressure rectificatio... | 10/28/2003 |
| 6638057 | Partial oxidation of hydrogen sulphide An air-oxygen hydrogen sulphide burner (108) fires into a furnace (102). The burner comprises a main passage for combustion-supporting gas containing air (112), a multiplicity of spaced apart outer elongate fluid-conducting open ended tubes extending in p... | 10/28/2003 |
| 6626639 | Vacuum pump A compound vacuum pump includes a regenerative section and a Holweck section. An annular abutment is formed on the radially innermost rotating cylinder of the Holweck section. The abutment acts to cause dust and foreign particles entering an inlet of the ... | 09/30/2003 |
| 6616908 | Treatment of a gas stream containing hydrogen sulphide Sour gas containing hydrogen sulphide has hydrogen sulphide absorbed therefrom in an absorbent in a vessel 4. A hydrogen sulphide rich gas stream is formed by desorbing hydrogen sulphide from the absorbent in a vessel 12. The resulting hydrogen sulphide r... | 09/09/2003 |
| 6609393 | Introgen rejection method A method of forming a methane product by rejecting nitrogen from a feed gas stream comprising methane and nitrogen is disclosed. After being cooled in a main heat exchanger, the feed gas stream is rectified in a double rectification column comprising a hi... | 08/26/2003 |
| 6585111 | Metal foam container A gas container is made from metal foam and the spaces defined by the open-celled structure are filled with a solid adsorbent material such as a zeolite or an activated carbon. The container may be made in the form of a panel.... | 07/01/2003 |
| 6584803 | Nitrogen rejection method and apparatus Nitrogen is rejected from a feed gas stream comprising methane and nitrogen so as to form a methane product. The feed gas stream is cooled in a main heat exchanger and rectified in a double rectification column comprising a higher pressure column, a lower... | 07/01/2003 |
| 6536676 | Valves A valve assembly comprising a housing having an inlet and space therefrom an outlet, means located in the housing for controlling the flow of fluid between the inlet and the outlet, said means including a main valve movable between a first relatively clos... | 03/25/2003 |
| 6530977 | Abatement of semiconductor processing gases A method for the abatement of one or more pyrophoric gases in a gas stream, which includes introducing water in to the gas stream and/or mixing the gas stream with preheated air and introducing the gas stream in to a container in which the pyrophoric gase... | 03/11/2003 |
| 6517801 | Treatment of gas streams containing hydrogen sulphide A feed gas stream containing hydrogen sulphide is subjected in a furnace 6 to reactions in which part of the hydrogen sulphide is burned to form sulphur dioxide, and is which the sulphur dioxide reacts with residual hydrogen sulphide to form sulphur vapor... | 02/11/2003 |
| 6488905 | Destruction of waste gas A gas stream containing at least 50% by volume of ammonia but eventually no hydrogen sulphide is burned in a reaction region which is supplied with oxygen and oxygen-enriched air. Both combustion and thermal cracking of ammonia takes place in the reaction... | 12/03/2002 |
| 6473945 | Flange clamp A flexible clamp comprising a plurality of plastics links each link being a snap-fit with the next adjacent link thereby permitting a user to alter the length of the chain by the addition or subtraction of one or more links, and means for latching the fre... | 11/05/2002 |
| 6474171 | Vacuum gauge A vacuum gauge of the cold cathode type has a gauge head which includes a cathode discharge cell and an anode a portion of which is located within the cathode discharge cell. An electrically operated ignition device is located adjacent the cathode dischar... | 11/05/2002 |
| 6458316 | Reticulated foam structures A metal foam object results from the mixing of a gasifier with metal powder and subjecting the mixture to an elevated temperature T1 and pressure P1 to form a sintered sheet placing at least a portion of the sintered sheet into a mol... | 10/01/2002 |
| 6436175 | Adsorption apparatus A modular adsorption plant comprises one or more transportable cargo containers which hold the various adsorbent beds, pumping apparatus and so on which comprise the plant. The containers are easily transportable, and may be rapidly assembled in modular f... | 08/20/2002 |
| 6409499 | Variable stoichiometric combustion A method of combustion and an apparatus therefor in which separate streams of very lean and very rich fuel/oxidant mixture are combusted separately, the products of combustion therefrom being thoroughly mixed before final combustion takes place. The lean/... | 06/25/2002 |
| 6403047 | Treatment of gas mixtures A method for treating a gas stream containing one or more perfluoro-organic compounds to remove the perfluoro-organic compound(s) therefrom, which comprises bringing the gas stream in to contact with an alkali metal fluoride in the presence of carbon and ... | 06/11/2002 |
| 6379135 | Vacuum pumps A compound vacuum pump includes a pump body divided by a partition into upper and lower chambers. A screw pump section occupies the lower chamber and a Roots-type pump section occupies the upper chamber. The Roots-type pump section comprises two rotors ea... | 04/30/2002 |
| 6375413 | Vacuum pumps A vacuum pump for pumping gas from a pump inlet to a pump outlet, comprising a rotor and a stator body in which the rotor is adapted for rotation and including at least two molecular drag stages each comprising adjacent stationary and rotating Holweck cyl... | 04/23/2002 |
| 6371735 | Vacuum pumps A vacuum pump comprising a shaft rotatable by means of a motor, at least two spaced pump stages mounted on the shaft, a first pump inlet through which gas can pass for passage through all the pump stages for evacuating a first system and a second pump inl... | 04/16/2002 |
