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Class Information
Number: 73/745
Name: Measuring and testing > Fluid pressure gauge > Piston > With electrical readout
Description: Subject matter wherein the pressure being measured displaces a movable wall to generate or modify an electric current and the value of such current is indicative of the pressure.










Sub-classes under this class:

Class Number Class Name Patents
73/746 Resistive 28


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8375801 Sensitive differential pressure sensor and method Feb. 19, 2013
7458275 Welded header for pressure transmitter Dec. 2, 2008
7331240 Apparatus and method for connecting vehicle wheel sensors to a controller Feb. 19, 2008
7213465 Micromechanical sensor May. 8, 2007
7077009 Pressure sensitive surfaces Jul. 18, 2006
6978679 Hydraulic pressure sensor Dec. 27, 2005
6868720 Testing of pressure sensor in surgical cassette Mar. 22, 2005
6782753 Thermodynamic pressure/temperature transducer health check Aug. 31, 2004
6715359 Pressure sensitive surfaces Apr. 6, 2004
6595051 Fluid level sensing and control system Jul. 22, 2003
6591684 Pressure sensor intergrated into an electro-hydraulic control unit Jul. 15, 2003
6419456 Switch for controlling the motor of a piston pump Jul. 16, 2002
6224094 Force sensor for seat occupant weight sensor May. 1, 2001
6125707 Pressure detection device Oct. 3, 2000
5990428 Pressure switch for hydraulic pump Nov. 23, 1999
5693926 Differential pressure indicators Dec. 2, 1997
5602373 Differential pressure switch with an adjusting piston driven by a restoring spring for an oil-separating air filter Feb. 11, 1997
5537883 Piezoelectric pressure sensor and method of manufacturing the same Jul. 23, 1996
5490425 Ferrofluid pressure sensor and warning device Feb. 13, 1996
5461208 Compact high pressure snap-acting switch Oct. 24, 1995
5452613 Wide range vacuum gauge Sep. 26, 1995
5416294 Gas-flow operated switch May. 16, 1995
5381091 Sensor having mutually perpendicular sections using zigzag coils for detecting displacement Jan. 10, 1995
5377547 Piezoelectric pressure sensor having tubular charge detecting unit and method of assembling same Jan. 3, 1995
5365791 Signal generator Nov. 22, 1994
5331856 Pressure devices Jul. 26, 1994
5331838 Dead weight piston drive and control system Jul. 26, 1994
5319979 Load cell pressure sensor for pump cassette Jun. 14, 1994
5321220 Pressure switch Jun. 14, 1994
5317948 Pressure transducer using permanent magnet and opposing variable magnetic field Jun. 7, 1994
5256840 Holding device for piston position detector Oct. 26, 1993
5243158 Fluid operated pressure switch for controlling a switching element Sep. 7, 1993
5233142 Snap action electrical switching mechanism with dual set points Aug. 3, 1993
5187337 Fluid pressure actuated switch for fluid pump Feb. 16, 1993
5155309 Pneumatic actuator for a patient call system Oct. 13, 1992
5140113 Differential pressure control switch with a pivoting actuating lever and a biasing spring sealed in a housing Aug. 18, 1992
5092178 Differential pressure sensor mechanisms Mar. 3, 1992
5019678 Fluid flow switches with low flow resistance May. 28, 1991
4947732 Electro-hydraulic servo actuator with function for adjusting rigidity Aug. 14, 1990
4918267 Vacuum operated circuit breaker Apr. 17, 1990
4912291 Compact proximity switch arrangement Mar. 27, 1990
4879440 Proximity switch for a cylinder Nov. 7, 1989
4876531 Position detector for the movable element of a fluid-operated actuator Oct. 24, 1989
4866982 On-board tire pressure sensing system Sep. 19, 1989
4827095 Differential pressure switch assembly with high static pressure use characteristics May. 2, 1989
4803318 Proximity switch for a cylinder Feb. 7, 1989
4793188 Lubrication sensor apparatus Dec. 27, 1988
4792651 Pressure differential bypass sensor switch with magnetic thermal lockout Dec. 20, 1988
4778956 Pressure transducer with switch Oct. 18, 1988
4767897 Conductor structure for transducer switch Aug. 30, 1988

1 2










 
 
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