US3882408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Parametric acoustic surface wave amplifier
Assignee: Leland Stanford Junior University
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Filing: 1973-05-18
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Granted: 1975-05-06
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Expires: 1993-05-18
Abstract
Abstract A parametric acoustic surface wave amplifier which includes a pair of transducers located on an acoustic surface wave propagating medium at predetermined positions and coupled to phase-related pump signal generators to effect parametric amplification and reradiation of an amplified signal wave in only one direction.
Inventors
- 👤 Bertram A Auld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:47
CPC Classifications
H; H03; H03F; H03F7/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
100 words
A parametric acoustic surface wave amplifier which comprises an acoustic surface wave propagating medium, means for generating a signal acoustic surface wave to propagate along a predetermined path in said medium, means for generating two pump signals displaced in phase by 90* and having a predetermined frequency relationship to said signal wave to enable parametric interaction, and means including a pair of transducers connected to said pump signal generating means and positioned on said medium at positions spaced on odd number of one-quarter wavelengths along said predetermined path such that additive relation of acoustic waves reradiated at said transducers occurs.
Claim 2
Dependent Claim
100 words
A parametric acoustic surface wave amplifier which comprises an acoustic surface wave propagating medium, means for generating a signal acoustic surface wave to propagate along a predetermined path in said medium, means for generating two pump signals displaced in phase by 90* and having a predetermined frequency relationship to said signal wave to enable parametric interaction, and means including a pair of transducers connected to said pump signal generating means and positioned on said medium at positions spaced on odd number of one-quarter wavelengths along said predetermined path such that additive relation of acoustic waves reradiated at said transducers occurs.
Claim 3
Dependent Claim
24 words
A parametric acoustic surface wave amplifier according to claim 1 wherein said transducers are spaced by an integral number of wavelengths plus one-quarter wavelength.
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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |