US3215944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spin wave pumped elastic wave parametric amplifier
Assignee: AT&T Inc
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Filing: 1964-01-30
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Granted: 1965-11-02
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Expires: 1984-01-30
Abstract
No abstract record available.
Inventors
- 👤 Matthews Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:02
CPC Classifications
H; H03; H03F; H03F7/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
113 words
AN ELASTIC WAVE AMPLIFIER COMPRISING A MEMBER OF NONCONDUCTIVE FERROMAGNETIC MATERIAL, MEANS FOR LAUNCHING AN ELASTIC WAVE OF SIGNAL FREQUENCY WS IN SAID MEMBER TO PROPAGATE THEREIN IN A GIVEN DIRECTION, MEANS FOR APPLYING TO A PORTION OF SAID MEMBER A RADIO FREQUENCY MAGNETIC FIELD ALTERNATING AT A FREQUENCY WP AND HAVING A SUBSTANTIAL COMPONENT AT RIGHT ANGLES TO SAID DIRECTION IN SAID PORTION, AND MEANS FOR APPLYING A STEADY MAGNETIC FIELD TO SAID MEMBER AT AN ACUTE ANGLE TO SAID GIVEN DIRECTION, SAID STEADY FIELD HAVING A STRENGTH WHICH BIASES SAID PORTION FOR MAXIMUM COUPLING BETWEEN ELASTIC WAVES AND SPIN WAVES IN SAID MATERIAL AT A FREQUENCY LYING BETWEEN WS AND WP.
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) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |