US3609593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vibratory reed device
Assignee: AT&T Inc
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Filing: 1966-05-25
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Granted: 1971-09-28
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Expires: 1986-05-25
Abstract
Abstract An oscillator comprising an elongated member to which a piezoresistive element is coupled, the member being capable of flexing in response to a change in temperature and having a resonant frequency of flexing vibration, said member having a minimum level of heating for producing continuous oscillation of the member at said resonant frequency, and direct current means for heating said member in response to the direct current applied to the piezoresistive element appropriate for supplying said minimum level of heating of the member and thereby to produce said oscillation of the member.
Inventors
- 👤 Harry J Boll
- 👤 Martin P Lepselter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:15
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/24
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
92 words
An oscillator comprising an elongated member to which a piezoresistive element is coupled, the member being capable of flexing in response to a change in temperature and having a resonant frequency of flexing vibration, said member having a minimum level of heating for producing continuous oscillation of the member at said resonant frequency, and direct current means for heating said member in response to the direct current applied to the piezoresistive element appropriate for supplying said minimum level of heating of the member and thereby to produce said oscillation of the member.
Claim 2
Dependent Claim
92 words
An oscillator comprising an elongated member to which a piezoresistive element is coupled, the member being capable of flexing in response to a change in temperature and having a resonant frequency of flexing vibration, said member having a minimum level of heating for producing continuous oscillation of the member at said resonant frequency, and direct current means for heating said member in response to the direct current applied to the piezoresistive element appropriate for supplying said minimum level of heating of the member and thereby to produce said oscillation of the member.
Claim 3
Dependent Claim
22 words
An oscillator according to claim 14 in which the elongated member includes amplifying means for providing positive feedback to the piezoresistive element.
Claim 4
Dependent Claim
50 words
An oscillator according to claim 1 in which the elongated member comprises semiconductive material and in which the piezoresistive element comprises semiconductive material formed within the semiconductive material of the elongated member and provided with contacts between which the resistance varies as a function of strain in the elongated member.
Claim 5
Dependent Claim
63 words
An oscillator according to claim 1 in which the member is an elongated member comprising an elongated crystal of semiconductive material and a strip of material bonded to a surface of said crystal and having a thermal coefficient of expansion differing from that of said crystal to promote flexing of said member at the resonant frequency in a direction normal to said surface.
Claim 6
Dependent Claim
15 words
An oscillator according to claim 4 in which the strip of material comprises a metal.
Claim 7
Dependent Claim
59 words
An oscillator according to claim 1 in which the member comprises an elongated member of semiconductive material, the piezoresistive element being physically attached to the elongated member, and the output abstracting means comprises a piezoresistive semiconductor diffused into said semiconductive material and provided with connections between which the resistance varies as a function of the strain in said material.
Claim 8
Dependent Claim
15 words
An oscillator according to claim 1 including means for abstracting an output from the member.
Claim 9
Dependent Claim
76 words
An oscillator according to claim 1 in which the member is an elongated meMber cantilevered upon a heat-conducting support and the piezoresistive element substantially has a spacing, L, from said support equal to (1/3) Alpha Tr, where Tr is the period of the resonant frequency and Alpha is the thermal diffusivity in compatible units, to produce maximum bending moment in said member on a steady state basis approximately one-quarter of said period after the maximum heating.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |