US3940992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transducer
Assignee: Texas Instruments Inc
•
Filing: 1973-12-26
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Granted: 1976-03-02
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Expires: 1993-12-26
Abstract
Abstract A magnetostrictive pressure transducer is disclosed wherein pressure in the range of 0 to 1000 psi can be accurately measured. The pressure transducer apparatus includes a diaphragm causing the pressure to be applied unidirectionally on sensor material having the property of undergoing changes in magnetic induction when a pressure is applied thereto, the change in magnetic induction being related to the applied pressure. The change in magnetic induction is measured and thus provides a measurement of the applied pressure. Several embodiments are also disclosed for measuring vacuum. In these embodiments force is also applied unidirectionally on the sensor material.
Inventors
- 👤 Ernest M. Jost
- 👤 Arthur L. Reenstra
- 👤 George Trenkler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:40
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/16
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
98 words
A pressure sensor comprising: a member having a longitudinal axis composed of magnetic material, the member having first and second ends, an electrical coil disposed about the member intermediate the ends thereof, a generally U-shaped yoke having first and second legs connected by a bight portion, the legs having free distal end portions in magnetic communication with the member, slots are provided in the free distal ends of the first and second legs of the yoke and the member is received in the slots, and means to provide an axial force along the longitudinal axis of the member.
Claim 2
Dependent Claim
98 words
A pressure sensor comprising: a member having a longitudinal axis composed of magnetic material, the member having first and second ends, an electrical coil disposed about the member intermediate the ends thereof, a generally U-shaped yoke having first and second legs connected by a bight portion, the legs having free distal end portions in magnetic communication with the member, slots are provided in the free distal ends of the first and second legs of the yoke and the member is received in the slots, and means to provide an axial force along the longitudinal axis of the member.
Claim 3
Dependent Claim
34 words
A sensor according to claim 1 further including magnetic material disposed between the tubular member and the first and second legs in which the magnetic material is a binder material loaded with ferrite powder.
Claim 4
Dependent Claim
14 words
A sensor according to claim 2 in which the binder material is paste like.
Claim 5
Dependent Claim
15 words
A sensor according to claim 1 in which the member is generally tubular in shape.
Claim 6
Dependent Claim
27 words
A sensor according to claim 4 in which the member is formed of a sheet of alloy having a layer of electrical insulation on opposite faces thereof.
Claim 7
Dependent Claim
26 words
A sensor according to claim 1 in which the member is formed of material selected from the group consisting of iron-cobalt alloys, nickel-iron alloys and ferrites.
Claim 8
Dependent Claim
16 words
A sensor according to claim 1 in which the member is in the form of scroll.
Claim 9
Dependent Claim
16 words
A sensor according to claim 7 in which the scroll is formed of an iron-cobalt alloy.
Claim 10
Dependent Claim
27 words
A sensor according to claim 7 in which the member is formed of a sheet of alloy having a layer of electrical insulation on opposite faces thereof.
Claim 11
Dependent Claim
18 words
A sensor according to claim 9 in which the sheet of alloy is approximately 2 mils in thickness.
Claim 12
Dependent Claim
20 words
A sensor according to claim 1 further including end caps placed on the first and second ends of the member.
Claim 13
Dependent Claim
19 words
A sensor according to claim 11 in which the end pieces are attached by an hydrostatic pressure transfer medium.
Claim 14
Dependent Claim
61 words
A pressure sensor comprising: a member having a longitudinal axis composed of magnetic material, the member configured as a scroll having first and second ends, an electrical coil disposed about the member intermediate the ends thereof, means defining a magnetic path in magnetic communication with the member, and means to provide an axial force along the longitudinal axis of the member.
Claim 15
Dependent Claim
61 words
A pressure sensor comprising: a member having a longitudinal axis composed of magnetic material, the member configured as a scroll having first and second ends, an electrical coil disposed about the member intermediate the ends thereof, means defining a magnetic path in magnetic communication with the member, and means to provide an axial force along the longitudinal axis of the member.
Claim 16
Dependent Claim
16 words
A sensor according to claim 13 in which the scroll is formed of an iron-cobalt alloy.
Claim 17
Dependent Claim
27 words
A sensor according to claim 13 in which the member is formed of a sheet of alloy having a layer of electrical insulation on opposite faces thereof.
Claim 18
Dependent Claim
18 words
A sensor according to claim 15 in which the sheet of alloy is approximately 2 mils in thickness.
Claim 19
Dependent Claim
20 words
A sensor according to claim 13 further including end caps placed on the first and second ends of the member.
References Cited (Backward Citations)
US1666680A
Cited
US2376156A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |