Patent US4170498A successfully refreshed from Google Patents.
US4170498A
Expired / Lapsed
US
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Transducer
Assignee: Texas Instruments Inc
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Filing: 1978-01-17
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Granted: 1979-10-09
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Expires: 1998-01-17
Abstract
Abstract A magnetostrictive pressure transducer is disclosed wherein pressure in the range of zero 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
2026-10-23 23:52
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/16; H; H04; H04R; H04R15/00; H10; H10N; H10N35/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
69 words
A method of making a magnetostrictive sensing element comprising the steps of taking a sheet of magnetic material, annealing the sheet to render it malleable, cutting the sheet in a traepzoidal configuration, rolling the sheet upon itself to form a scroll from one parallel end to another parallel end so that upon rolling the scroll will have conical ends and heat treating the sheet to optimize its magnetic properties.
Claim 2
Independent Claim
69 words
A method of making a magnetostrictive sensing element comprising the steps of taking a sheet of magnetic material, annealing the sheet to render it malleable, cutting the sheet in a traepzoidal configuration, rolling the sheet upon itself to form a scroll from one parallel end to another parallel end so that upon rolling the scroll will have conical ends and heat treating the sheet to optimize its magnetic properties.
Claim 3
Dependent Claim
23 words
A method according to claim 1 in which the material is selected from the group consisting of iron-cobalt alloys, nickel-iron alloys and ferrites.
Claim 4
Dependent Claim
25 words
A method according to claim 1 in which the material is an iron-cobalt alloy and the sheet is between 0.0005 and 0.01 inches in thickness.
Claim 5
Dependent Claim
24 words
A method according to claim 1 in which the heat treating step includes baking between 250° and 350° C. for 1 to 100 hours.
Claim 6
Dependent Claim
22 words
A method according to claim 4 in which the heat treating step includes baking at approximately 300° C. for approximately fifty hours.
Claim 7
Independent Claim
100 words
A method of making a magnetostrictive sensing element comprising the steps of taking a sheet of cobalt-iron alloy, annealing the sheet at a temperature in the range of approximately 840° to 860° C. to render it malleable, providing the sheet with insulating material, rolling the sheet from a first end to a second end into a tubular configuration in which the first end is spaced from the second end and heat treating the sheet including baking the sheet at a temperature in the range of approximately 250° to 350° C. for 1 to 100 hours to optimize its magnetic properties.
Claim 8
Independent Claim
100 words
A method of making a magnetostrictive sensing element comprising the steps of taking a sheet of cobalt-iron alloy, annealing the sheet at a temperature in the range of approximately 840° to 860° C. to render it malleable, providing the sheet with insulating material, rolling the sheet from a first end to a second end into a tubular configuration in which the first end is spaced from the second end and heat treating the sheet including baking the sheet at a temperature in the range of approximately 250° to 350° C. for 1 to 100 hours to optimize its magnetic properties.
Claim 9
Dependent Claim
18 words
A method according to claim 6 in which the sheet is rolled upon itself to form a scroll.
Claim 10
Dependent Claim
30 words
A method according to claim 7 including the step prior to rolling of cutting the sheet in a trapezoidal configuration so that upon rolling the scroll will having conical ends.
Claim 11
Dependent Claim
18 words
A method according to claim 6 in which the sheet is between 0.0005 and 0.01 inches in thickness.
Claim 12
Dependent Claim
22 words
A method according to claim 6 in which the heat treating step includes baking at approximately 300° C. for approximately fifty hours.
Claim 13
Dependent Claim
13 words
A method according to claim 6 in which the insulating material is polyimide.
References Cited (Backward Citations)
US1586883A
Cited
US1673790A
Cited
US1739752A
Cited
US2414457A
Cited
US2376156A
Cited
US3183126A
Cited
US3162795A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-08 | 1983-04-09 | 1983-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-08 | 1987-04-09 | 1987-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-08 | 1991-04-09 | 1991-10-09 | $7700.00 | Window Closed / Lapsed |