US4909083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure/differential pressure measuring device
Assignee: Barton Instrument Systems LLC
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Filing: 1989-06-26
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Granted: 1990-03-20
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Expires: 2009-06-26
Abstract
Abstract A pressure/differential pressure measuring device having a range plate with static and differential pressure sensors mounted therein. A high pressure isolation plate is mounted on one side of the range plate with a high pressure diaphragm mounted on the side of the high pressure isolation plate away from the range plate and sealed thereto forming a first fluid chamber between the inside of the high pressure diaphragm and the high pressure isolation plate side of the sensor assemblies. A low pressure isolation plate is mounted on the other side of the range plate with a low pressure diaphragm mounted on the side of the low pressure isolation plate away from the range plate and sealed thereto forming a second fluid chamber between the inside of said low pressure diaphragm and the low pressure isolation plate side of the sensor assemblies. A conduit between the first and second fluid chambers has a range diaphragm mounted to isolate the first and second chambers and means are provided to apply the high and low pressure to the outside of the high and low pressure diaphragms respectively.
Inventors
- 👤 Abdolmajid Fazeli
- 👤 Joseph J. Ponzi
- 👤 Ernst R. Ginkel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:19
CPC Classifications
G; G01; G01L; G01L13/00; G01L13/02; G01L13/025; G01L15/00; G01L19/00; G01L19/0007; G01L19/0046; G01L9/00; G01L9/0041; G01L9/0051; G01L9/0052; G01L9/0054
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
183 words
A pressure/differential pressure measuring device comprising; a range plate, a static pressure sensor assembly and a differential pressure sensor assembly mounted in said range plate, a high pressure isolation plate mounted on one side of said range plate, a high pressure diaphragm mounted on the side of said high pressure isolation plate away from said range plate and sealed thereto, a first fluid chamber between the inside of said high pressure diaphragm and the high pressure isolation plate side of said sensor assemblies, a low pressure isolation plate mounted on the other side of said range plate, a low pressure diaphragm mounted on the side of said low pressure isolation plate away from said range plate and sealed thereto, a second fluid chamber between the inside of said low pressure diaphragm and the low pressure isolation plate side of said sensor assemblies, a conduit between said first and second fluid chambers, a range diaphragm mounted at said conduit isolating said first and second chambers, and means to apply high and low pressure to the outside of said high and low pressure diaphragms respectively.
Claim 2
Dependent Claim
183 words
A pressure/differential pressure measuring device comprising; a range plate, a static pressure sensor assembly and a differential pressure sensor assembly mounted in said range plate, a high pressure isolation plate mounted on one side of said range plate, a high pressure diaphragm mounted on the side of said high pressure isolation plate away from said range plate and sealed thereto, a first fluid chamber between the inside of said high pressure diaphragm and the high pressure isolation plate side of said sensor assemblies, a low pressure isolation plate mounted on the other side of said range plate, a low pressure diaphragm mounted on the side of said low pressure isolation plate away from said range plate and sealed thereto, a second fluid chamber between the inside of said low pressure diaphragm and the low pressure isolation plate side of said sensor assemblies, a conduit between said first and second fluid chambers, a range diaphragm mounted at said conduit isolating said first and second chambers, and means to apply high and low pressure to the outside of said high and low pressure diaphragms respectively.
Claim 3
Dependent Claim
46 words
The pressure measuring device of claim 1 in which means are provided for seating the high pressure diaphragm against the high pressure isolation plate and the low pressure diaphragm against the low pressure isolation plate after application of pressure to prevent over-pressure application against the sensors.
Claim 4
Dependent Claim
35 words
The measuring device of claim 2 having said range diaphragm mounted on one side of said range plate and capable of movement with respect to the range plate until the high pressure diaphragm is seated.
Claim 5
Dependent Claim
90 words
The pressure measuring device of claim 3 including a fourth diaphragm mounted on the range plate and having a conduit running from the first fluid chamber to its high pressure side, said fourth diaphragm being normally seated and not movable as long as the pressure on the high pressure side remains higher than the pressure on the low pressure side but capable of movement if the pressure on the low pressure side should exceed that on the high pressure side until such time as the low pressure diaphragm is seated.
Claim 6
Dependent Claim
102 words
The measuring device of claim 1 in which said differential pressure sensor comprises a piezoresistive sensor chip mounted on a chip carrier having an aperture therethrough leading to a chamber on the underside of said sensor chip, a hollow stem bonded to the side of said chip carrier away from said chip with said aperture in communication with the hollow inside said stem, means bonding the other end of said stem to the low pressure side of said range plate, said chip carrier and said stem being made of a material to minimize thermal expansion effects on the sensitivity of said sensor.
Claim 7
Dependent Claim
16 words
The measuring device of claim 5 in which said chip carrier and said stem are nonmetallic.
Claim 8
Dependent Claim
12 words
The measuring device of claim 6 wherein said nonmetallic stem is ceramic.
Claim 9
Dependent Claim
103 words
The measuring device of claim 1 in which said differential pressure sensor comprises a piezoresistive sensor chip mounted on a glass chip carrier having an aperture therethrough leading to a chamber on the underside of said sensor chip, a hollow glass stem bonded to the side of said chip carrier away from said chip with said aperture in communication with the hollow inside said stem, a hollow metallic stem mount mounted to said glass side by epoxy sufficiently far down said glass stem to minimize thermal expansion effects and joined on its other end to the low pressure side of said range plate.
Claim 10
Dependent Claim
78 words
The measuring device of claim 1 in which said static pressure sensor comprises a piezoresistive sensor chip having an evacuated chamber on a side which is mounted on a chip carrier, a stem bonded to the side of said chip carrier away from said chip and joined on its other end to the low pressure side of said range plate said chip carrier and stem being made of a material to minimize thermal expansion effects on said sensor.
Claim 11
Dependent Claim
15 words
The measuring device of claim 9 in which said chip carrier and stem are nonmetallic.
Claim 12
Dependent Claim
13 words
The measuring device of claim 10 in which said nonmetallic stem is ceramic.
Claim 13
Dependent Claim
81 words
The measuring device of claim 1 in which said static pressure sensor comprises a piezoresistive sensor chip having a evacuated chamber on one side which is mounted on a glass chip carrier, a glass stem bonded to the side of said chip carrier away from said chip, a metallic stem epoxied to said glass stem sufficiently far down said glass stem to minimize thermal expansion effects and joined on its other end to the low pressure side of said range plate.
References Cited (Backward Citations)
US1018561A
Cited
US4841776A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-19 | 1993-09-18 | 1994-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-19 | 1997-09-18 | 1998-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-19 | 2001-09-18 | 2002-03-20 | $7700.00 | Window Closed / Lapsed |