| Patents for G01L 21 - Vacuum gauges (1,613) |
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| 09/24/1996 | US5557972 Miniature silicon based thermal vacuum sensor and method of measuring vacuum pressures |
| 08/14/1996 | CN2233082Y Air leakage alarm for vacuum system |
| 07/31/1996 | CN1127885A Electromagnetic force driven diaphragm vacuum gauge |
| 07/23/1996 | US5539674 Minimum reading pressure gage with dual function sensor |
| 06/27/1996 | WO1996019720A1 Penning measuring cell with ignition aid |
| 06/27/1996 | DE4445828A1 Penning-Meßzelle mit Zündhilfe Penning cell with ignition aid |
| 06/25/1996 | US5528939 Micromechanical pressure gauge having extended sensor range |
| 05/29/1996 | CN2228226Y Micropressure sensor of polysilicon film |
| 05/22/1996 | CN1122909A Method and apparatus for measuring the partial pressure of water vapor in vacuum |
| 05/02/1996 | DE4438591A1 Interference arcing protection system for power distribution switchgear |
| 03/21/1996 | WO1996008705A1 Miniature silicon based thermal vacuum sensor and method of measuring vacuum pressures |
| 01/03/1996 | EP0689670A1 Heat conductance vacuum gauge with measuring cell, measuring instrument and connecting cable |
| 01/03/1996 | EP0689669A1 Temperature compensation in a regulated heat conduction vacuum gauge |
| 12/12/1995 | US5475623 Method for the conversion of a measured signal, a converter as well as a measurement setup and a pirani measuring circuit |
| 10/25/1995 | EP0678887A1 Electrical apparatus with integrated pressure detection |
| 10/25/1995 | CN2211068Y Fluid negative-pressure measuring sensor |
| 10/20/1995 | CA2147228A1 Electrical gear with built-in pressure detection |
| 09/26/1995 | US5452613 Wide range vacuum gauge |
| 09/06/1995 | CN2206954Y Vacuum degree protection and detecting device of high-voltage vacuum circuit breaker |
| 08/03/1995 | DE19501773A1 Apparatus for measuring vacuum pressure in vacuum switch chamber of electrical switchgear |
| 07/12/1995 | EP0662607A1 Ionisation gauge with micropoint cathode |
| 06/29/1995 | WO1995017654A1 Gas friction vacuum indicator with a gas friction sensor that rotates around a fixed axis of rotation |
| 06/29/1995 | CA2179750A1 Gas friction vacuum indicator with a gas friction sensor that rotates around a fixed axis of rotation |
| 06/28/1995 | EP0660096A2 Microvacuum sensor with extended sensitivity range |
| 06/21/1995 | EP0658755A1 Procedure for evaluating the output signals of two pressure sensors, corresponding device with two sensors and pressure sensor head |
| 06/06/1995 | US5422573 Ionization gauge and method of using and calibrating same |
| 05/18/1995 | WO1995013526A1 Extractor/ionization vacuum gauge |
| 03/15/1995 | CN2192032Y Device for measuring superhigh vacuum small-size ionic pump |
| 02/08/1995 | EP0637551A1 System that insures tamper resistance |
| 12/13/1994 | US5373240 Hot-cathode ionization pressure gauge including a sequence of electrodes arranged at a distance from one another in sequence along an axis |
| 11/30/1994 | EP0626573A2 Convection thermocouple vacuum gauge |
| 11/16/1994 | CN1095159A Wide measurement range microionization gauge |
| 11/02/1994 | EP0622621A2 Opposed magnet ionization gauge |
| 10/06/1994 | DE4310324A1 Structure of a micro-Pirani sensor and its temperature compensation method |
| 10/04/1994 | US5351551 Convection thermocouple vacuum gauge |
| 09/29/1994 | WO1994021994A1 Heat conductance vacuum gauge with measuring cell, measuring instrument and connecting cable |
| 09/29/1994 | WO1994021993A1 Temperature compensation in a regulated heat conduction vacuum gauge |
| 09/20/1994 | US5347869 Structure of micro-pirani sensor |
| 09/14/1994 | CN2177234Y On-line detector of high voltage vacuum arc extinguishing room vacuum degree |
| 09/14/1994 | CN2177233Y Digit thermal couple vacuum gauge |
| 08/17/1994 | EP0611084A1 Magnetic structures |
| 08/03/1994 | CN2173398Y Electronic vacuum tester and high-frequency counterchange step-up transformer |
| 07/21/1994 | DE4300893A1 Press. sensor for ultra-high vacuum pressure container |
| 05/31/1994 | US5317270 Cold cathode ionization vacuum gauge with guard ring |
| 05/11/1994 | EP0596274A1 Vacuum cleaner pressure sensor device |
| 04/05/1994 | US5300890 Hot-cathode ionization pressure gauge including a sequence of electrodes arranged at a distance from one another in sequence along an axis |
| 03/22/1994 | US5296817 Ionization gauge and method of using and calibrating same |
| 01/27/1994 | DE4324119A1 Conversion of measured signal using Pirani circuit - using bipolar transistors to produce logarithmic function based on variation of base-emitter voltage w.r.t. collector currents |
| 01/11/1994 | US5278510 Ionization vacuum gauge using a cold micropoint cathode |
| 01/11/1994 | US5277067 Miniature pressure sensor and pressure sensor arrays |
| 11/10/1993 | CN2145640Y Vacuum safety bottle |
| 10/05/1993 | US5250906 Ionization gauge and method of using and calibrating same |
| 08/26/1993 | DE4205551A1 Temp. compensation circuit for regulated heat conductance vacuum meter - has Wheatstone bridge circuit with regulated supply voltage and further circuit carrying current independent of bridge supply voltage |
| 07/28/1993 | EP0552884A2 Pressure transducer with quartz crystal |
| 07/20/1993 | US5228344 Method of measuring pressures using a tuning fork crystal oscillator |
| 06/22/1993 | US5221873 Pressure transducer with quartz crystal of singly rotated cut for increased pressure and temperature operating range |
| 05/19/1993 | DE4137527A1 Ionisation gas pressure gauge for low pressure measurement - has electron emitting cathode with numerous field emitter elements, and applies positive voltage to extraction grating |
| 04/21/1993 | EP0537770A2 Ionization gauge and method of using and calibrating same |
| 03/30/1993 | US5198772 Removable discharge initiating means for cold cathode discharge ionization gauge |
| 03/09/1993 | US5191799 Measured value receiver for vacuum measurement |
| 02/16/1993 | US5187674 For determining fuel gas pressure |
| 02/11/1993 | DE4126275A1 Quantitatively measuring vacuum in closed container - bringing latter into electrical field of HV source and ionising residual gas and measuring second breakdown voltage |
| 01/27/1993 | EP0524870A1 Ionization-vacuum gauge |
| 12/08/1992 | US5170057 Method and apparatus for measuring the partial pressure of a gas in a vacuum |
| 12/02/1992 | EP0516422A2 Improvements relating to vacuum gauges |
| 11/17/1992 | US5163328 Miniature pressure sensor and pressure sensor arrays |
| 08/12/1992 | CN1063555A Tube for wide-range thermocouple gauge used under constant temp. |
| 08/11/1992 | US5136885 Quartz crystal pressure sensor |
| 07/22/1992 | EP0262223B1 Detector for gas chromatograph |
| 07/21/1992 | US5131263 Device and a method for detecting leaks |
| 07/08/1992 | CN2109635U Four pole wide range ionozation gauge tube |
| 07/07/1992 | US5128617 Ionization vacuum gauge with emission of electrons in parallel paths |
| 07/02/1992 | DE4040601A1 Pressure measurement with gas friction vacuum meter - measuring time of delay of quartz vibration amplitude with vibrator isolated from oscillator |
| 07/01/1992 | EP0493074A2 Vacuum gauge |
| 06/24/1992 | CN2108294U Heat-radiation-resistant thermocouple vacuum gauge |
| 06/09/1992 | US5121120 Programmable digital measuring and control instrument for a vacuum gauge |
| 05/07/1992 | DE4034452A1 Glow cathode ionisation manometer - has auxiliary mesh around glow cathode, mesh electrode and ion collector and outer electrode plate |
| 05/06/1992 | CN2103804U Harmless detector for can vacuum degree |
| 03/04/1992 | CN2098026U Halogen chase leaks tube with measuring pressure |
| 03/03/1992 | US5092740 Composite vacuum pump |
| 02/12/1992 | EP0470853A2 Method of measuring pressures using a tuning fork crystal oscillator |
| 01/29/1992 | CN2094739U Can vacuum degree test instrument |
| 01/22/1992 | CN2094055U Vacuum in cans measuring and controlling apparatus |
| 01/14/1992 | US5079954 Vacuum gauge |
| 11/20/1991 | CN1014834B Gas chromatography detector |
| 11/12/1991 | US5064296 Integrated semiconductor circuit for thermal measurements |
| 11/12/1991 | US5063783 Pressure monitoring and method |
| 10/30/1991 | CN1055817A Measuring and controlling instrument for vacuity of can |
| 07/23/1991 | US5033306 Quartz vacuum gauge |
| 07/17/1991 | CN2081089U In-line detector for vacuity of vacuum switch |
| 07/03/1991 | EP0435611A2 Versatile, overpressure proof, absolute pressure sensor |
| 06/19/1991 | EP0432305A1 Method and apparatus for leak detection |
| 06/16/1991 | CA2031075A1 A device and a method for detecting leaks |
| 05/07/1991 | US5014009 Detector for gas chromatograph for detecting ammonia and amine compounds |
| 04/17/1991 | CN2075386U Thermocouple vacuum tube |
| 02/26/1991 | US4995265 Degradation and contamination compensated tuning fork quartz monometer, and method to compensate for tuning quartz degradation and contamination |
| 02/26/1991 | US4995264 Gas pressure gauge and pressure measuring method |
| 02/26/1991 | US4995263 Tuning fork quartz manometer |
| 01/29/1991 | US4988871 Gas partial pressure sensor for vacuum chamber |
| 01/22/1991 | CA1279204C Gas pressure gage |