US4212209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential pressure to electric current transducer employing a strain sensitive resistive pattern on a substrate having a high modulus of elasticity
Assignee: Honeywell Inc
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Filing: 1978-09-07
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Granted: 1980-07-15
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Expires: 1998-09-07
Abstract
Abstract In a differential pressure to electric current transducer, a short sapphire slab carries a strain sensitive resistive pattern. The sapphire slab is an element of a much larger beam as the beam moves to change the stress of the other surfaces of the sapphire slab and varies the resistance of the silicon resistive pattern to produce an electric current signal indicative of the differential pressure.
Inventors
- 👤 William F. Newbold
- 👤 Gurnam Singh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:55
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/0041; G01L9/0051; G01L9/0052; G01L13/00; G01L13/02; G01L13/025; G01L9/0082; G01L9/0083
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
157 words
A differential pressure to current transducer comprising in combination: a transducer housing; a strain sensitive element including a resistive pattern on a slab which has high modulus of elasticity; a header secured in said housing; a rigid beam extender embedded in and secured to one end of said slab, said beam extender at least eight times as long as said slab; the other end of said slab embedded in and secured to said header with said beam extender and slab in combination forming an extended cantilever beam; a pair of diaphragms secured to said housing, at least one of said diaphragms being a capsule; a fluid passage in said housing coupling a pressure exerted on one diaphragm to the other diaphragm; and means coupling an interior wall of said capsule to said rigid beam extender, whereby movement of the wall causes movement of said beam extender and a change in the resistive values of said resistive pattern.
Claim 2
Dependent Claim
157 words
A differential pressure to current transducer comprising in combination: a transducer housing; a strain sensitive element including a resistive pattern on a slab which has high modulus of elasticity; a header secured in said housing; a rigid beam extender embedded in and secured to one end of said slab, said beam extender at least eight times as long as said slab; the other end of said slab embedded in and secured to said header with said beam extender and slab in combination forming an extended cantilever beam; a pair of diaphragms secured to said housing, at least one of said diaphragms being a capsule; a fluid passage in said housing coupling a pressure exerted on one diaphragm to the other diaphragm; and means coupling an interior wall of said capsule to said rigid beam extender, whereby movement of the wall causes movement of said beam extender and a change in the resistive values of said resistive pattern.
Claim 3
Dependent Claim
155 words
A differential pressure to current transducer comprising in combination: a transducer housing; a strain sensitive element including a silicon resistive pattern on a sapphire slab; a header secured in said housing; a rigid beam extender embedded in and secured to one end of said sapphire slab, said beam extender at least eight times as long as said slab; the other end of said sapphire slab embedded in and secured to said header with said beam extender and slab in combination forming an extended cantilever beam; a pair of diaphragms secured to said housing, at least one of said diaphragms being a capsule; a fluid passage in said housing coupling a pressure exerted on one diaphragm to the other diaphragm; and means coupling an interior wall of said capsule to said rigid beam extender, whereby movement of the wall causes movement of said beam extender and a change in the resistive values of said resistive pattern.
Claim 4
Dependent Claim
155 words
A differential pressure to current transducer comprising in combination: a transducer housing; a strain sensitive element including a silicon resistive pattern on a sapphire slab; a header secured in said housing; a rigid beam extender embedded in and secured to one end of said sapphire slab, said beam extender at least eight times as long as said slab; the other end of said sapphire slab embedded in and secured to said header with said beam extender and slab in combination forming an extended cantilever beam; a pair of diaphragms secured to said housing, at least one of said diaphragms being a capsule; a fluid passage in said housing coupling a pressure exerted on one diaphragm to the other diaphragm; and means coupling an interior wall of said capsule to said rigid beam extender, whereby movement of the wall causes movement of said beam extender and a change in the resistive values of said resistive pattern.
Claim 5
Dependent Claim
27 words
A differential pressure to current transducer as in claim 2 wherein said means coupling an interior wall of said capsule to said beam extender is a spring.
Claim 6
Dependent Claim
182 words
A differential pressure to current transducer comprising in combination: a transducer housing; a strain sensitive element including a resistive pattern on a slab which has a high modulus of elasticity; a header secured in said housing; a rigid beam extender secured to one end of said slab; the other end of said slab embedded in and secured to said header with said beam extender and slab in combination forming an extended cantilever beam; a pair of diaphragms secured to said housing; a fluid passage in said housing coupling a pressure exerted on one diaphragm to the other diaphragm; a sleeve attached to one of said diaphragms, said sleeve extending into a part of said fluid passage and attached to said housing at a point adjacent said beam extender means so that said sleeve and said diaphragm can move relatively to said housing except at said point of attachment; and means coupling one of said diaphragms to said rigid beam extender, whereby movement of said diaphragm causes movement of said beam extender and a change in the resistive values of said resistive pattern.
Claim 7
Dependent Claim
182 words
A differential pressure to current transducer comprising in combination: a transducer housing; a strain sensitive element including a resistive pattern on a slab which has a high modulus of elasticity; a header secured in said housing; a rigid beam extender secured to one end of said slab; the other end of said slab embedded in and secured to said header with said beam extender and slab in combination forming an extended cantilever beam; a pair of diaphragms secured to said housing; a fluid passage in said housing coupling a pressure exerted on one diaphragm to the other diaphragm; a sleeve attached to one of said diaphragms, said sleeve extending into a part of said fluid passage and attached to said housing at a point adjacent said beam extender means so that said sleeve and said diaphragm can move relatively to said housing except at said point of attachment; and means coupling one of said diaphragms to said rigid beam extender, whereby movement of said diaphragm causes movement of said beam extender and a change in the resistive values of said resistive pattern.
Claim 8
Dependent Claim
25 words
A differential pressure to current transducer as in claim 4 wherein said means coupling one of said diaphragms to said beam extender is a spring.
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) | 1983-07-15 | 1984-01-14 | 1984-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-15 | 1988-01-14 | 1988-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-15 | 1992-01-14 | 1992-07-15 | $7700.00 | Window Closed / Lapsed |