US4722228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remote seal-type pressure signal generator
Assignee: Honeywell Inc
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Filing: 1986-11-14
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Granted: 1988-02-02
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Expires: 2006-11-14
Abstract
Abstract A remote seal-type pressure signal generator has a pressure measuring end having a sealing diaphragm facing a pressure to be measured, a pressure detector body connected to the pressure measuring end through a first capillary tube, the detector body having a pressure-receiving space in which a pressure transmitting medium is liquid-sealed and pressure detecting means for detecting an internal pressure of the pressure-receiving space by way of a pressure difference thereof with respect to a pressure of a second pressure-receiving space to which a second pressure is applied, and a flexible protective pipe covering the capillary tube between said detector body and said pressure measuring end, a second capillary tube is housed in the protective tube, and extending from the second pressure-receiving space in the detector body while having substantially the same length as the first capillary tube, and having a distal end closed in the vicinity of the pressure measuring end, with the pressure transmitting medium being liquid-sealed in the second pressure-receiving space and the second capillary tube.
Inventors
- 👤 Shunichiro Awa
- 👤 Jun Kawachi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:31
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/14; G01F23/16; G01F23/164; G01L; G01L13/00; G01L13/02; G01L13/025; G01L13/026; G01L19/00; G01L19/0007; G01L19/0046
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
175 words
A remote seal-type signal generator comprising a first capillary tube having a pressure measuring end with a sealing diaphragm facing a pressure measured portion and continuous with said measuring end, a detector body connected to said pressure measuring end through said capillary tube, said detector body having a pressure-receiving space in which a pressure transmitting medium is liquid-sealed and pressure detecting means for detecting an internal pressure of said pressure-receiving space by way of a pressure difference thereof with respect to a pressure of a second pressure-receiving space to which atmospheric pressure is applied, a protective pipe covering said capillary tube between said detector body and said pressure measuring end, and a second capillary tube housed in said protective pipe, said second capillary tube extending from said second pressure-receiving space in said detector body, having substantially the same length as said first capillary tube, and having a distal end closed in the vicinity of said pressure measuring end, and the pressure transmitting medium is liquid-sealed in said second pressure-receiving space and said second capillary tube.
Claim 2
Dependent Claim
175 words
A remote seal-type signal generator comprising a first capillary tube having a pressure measuring end with a sealing diaphragm facing a pressure measured portion and continuous with said measuring end, a detector body connected to said pressure measuring end through said capillary tube, said detector body having a pressure-receiving space in which a pressure transmitting medium is liquid-sealed and pressure detecting means for detecting an internal pressure of said pressure-receiving space by way of a pressure difference thereof with respect to a pressure of a second pressure-receiving space to which atmospheric pressure is applied, a protective pipe covering said capillary tube between said detector body and said pressure measuring end, and a second capillary tube housed in said protective pipe, said second capillary tube extending from said second pressure-receiving space in said detector body, having substantially the same length as said first capillary tube, and having a distal end closed in the vicinity of said pressure measuring end, and the pressure transmitting medium is liquid-sealed in said second pressure-receiving space and said second capillary tube.
Claim 3
Dependent Claim
17 words
A signal generator as set forth in claim 1 wherein said protective pipe is a flexible tube.
Claim 4
Dependent Claim
16 words
A signal generator as set forth in claim 1 wherein said pressure-transmitting medium is silicone oil.
Claim 5
Dependent Claim
186 words
A remote seal-type differential pressure signal generator comprising a detector body said detector body having a pair of pressure-receiving spaces defined from each other and means for detecting a pressure difference therebetween, a first pair of capillary tubes having a pair of pressure measuring ends said pair of first capillary tubes respectively extending from said pressure-receiving spaces of said detector body, said pair of pressure measuring ends having sealing diaphragms respectively continuous with extending ends of said capillary tubes and facing a pressure-measured portion, a pair of protective pipes, said pair of protective tubes respectively covering said capillary tubes between said detector body and said pressure measuring ends, and second capillary tubes having substantially the same lengths as said first capillary tubes are respectively arranged in said protective pipes to be parallel to each other, one ends of said second capillary tubes are closed in the vicinity of said pressure measuring ends and the other ends thereof are respectively connected to corresponding ones of said pressure-receiving spaces in said detector body, and a pressure transmitting medium is liquid sealed in said first and second capillary tubes.
Claim 6
Dependent Claim
186 words
A remote seal-type differential pressure signal generator comprising a detector body said detector body having a pair of pressure-receiving spaces defined from each other and means for detecting a pressure difference therebetween, a first pair of capillary tubes having a pair of pressure measuring ends said pair of first capillary tubes respectively extending from said pressure-receiving spaces of said detector body, said pair of pressure measuring ends having sealing diaphragms respectively continuous with extending ends of said capillary tubes and facing a pressure-measured portion, a pair of protective pipes, said pair of protective tubes respectively covering said capillary tubes between said detector body and said pressure measuring ends, and second capillary tubes having substantially the same lengths as said first capillary tubes are respectively arranged in said protective pipes to be parallel to each other, one ends of said second capillary tubes are closed in the vicinity of said pressure measuring ends and the other ends thereof are respectively connected to corresponding ones of said pressure-receiving spaces in said detector body, and a pressure transmitting medium is liquid sealed in said first and second capillary tubes.
Claim 7
Dependent Claim
20 words
A signal generator as set forth in claim 4 wherein said pair of protective pipes are each a flexible tube.
Claim 8
Dependent Claim
16 words
A signal generator as set forth in claim 4 wherein said transmitting medium is silicone oil.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-01 | 1991-08-03 | 1992-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-01 | 1995-08-03 | 1996-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-01 | 1999-08-03 | 2000-02-02 | $7700.00 | Window Closed / Lapsed |