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| Number | Title | Issue Date |
| 7392686 | Calibration apparatus for vacuum gauge having combined use of 1 Torr level, 10 Torr level, and 100 Torr level Disclosed herein is a calibration apparatus for vacuum gauge having a combined use for an 1 Torr level, a 10 Torr level, and a 100 Torr level vacuum gauge. According to the present invention, there is provided a calibration apparatus for vacuum gauge, in which a sta... | 07/01/2008 |
| 7267137 | Deadweight pressure standards using non-hysteresis sylphons A deadweight pressure standard provides improved measurement accuracy and repeatability. The standard includes a flow regulator having a first valve controlled by a first pair of non-hysteresis sylphons, and a supply regulator having a second valve controlled by a s... | 09/11/2007 |
| 7188531 | Pressure gauge for use with sanitary conduit A standard industrial pressure gauge is adapted for a sanitary conduit that has been provided with a tubular stub for mounting the gauge. A cylinder has a disk flange that mates with an upper flange of the tubular stub. A cap closes off the top of the cylinder, and ... | 03/13/2007 |
| 7146843 | Extreme low air pressure deadweight tester The present invention relates to Deadweight Pressure Testers used for the calibration of air pressure transducers. An air pressure transducer, which is to be calibrated, is set in parallel with the deadweight tester. Air is slowly pumped into the cylinder and the pr... | 12/12/2006 |
| 6701791 | Modular piston gauge method and apparatus A device for accurately measuring the pressure (Pg) of very highly pressurized gas includes a cylinder (16) having a cylindrical outer surface (16A) and a bore extending through the cylinder and an elongated piston (23) rotatable and vertically movable in... | 03/09/2004 |
| 5331838 | Dead weight piston drive and control system An improved dead weight piston pressure measurement/calibration device includes a cylinder and a dead weight piston assembly that includes a piston rotatable and vertically in the cylinder, bell housing supported by the piston and carrying a number of cal... | 07/26/1994 |
| 5259235 | Pressure standard A differential pressure gage apparatus is disclosed which utilizes two pistons movable within three bores to produce accurate differential pressures. An inner piston carried by an outer piston has sufficient length to extend into all bores at once.... | 11/09/1993 |
| 5025654 | Pressure standard device The present invention embodies a calibration/testing device having a housing having a generally cylindrical recess, a piston guided within the recess via a hydrostatic/aerostatic bearing, a pressure chamber formed between the piston and the cylindrical re... | 06/25/1991 |
| 4594877 | Pneumatic deadweight tester incorporating dampening means A weight carrier rests on a floating ceramic ball supported within a nozzle by flow-regulated air. The air flows in an inlet path within the nozzle to support the ball and then exits through an outlet path downstream of the ball. A pressure regulator main... | 06/17/1986 |
| 3956939 | Rotary-piston measuring device A cylinder has spaced ends and a piston is slidably and turnably received in this cylinder. An opening is provided through which a pressure fluid is admitted into the cylinder at one end, and an arrangement is provided which is connected with the piston s... | 05/18/1976 |
