US3825860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface wave delay line with quarter-wave taps
Assignee: United States Department of the Air Force
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Filing: 1972-12-13
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Granted: 1974-07-23
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Expires: 1992-12-13
Abstract
Abstract A surface wave delay line apparatus utilizing quarter-wave taps in a multiply tapped Li NbO3 delay line to reduce reflections.
Inventors
- 👤 P Carr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:30
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/125; H03H9/145; H03H9/14544; H03H9/14552; H03H9/02535; H03H9/02818
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
An acoustical surface wave apparatus as described in claim 1 wherein said plurality of interleaved metal electrode pairs comprise 50 electrode pairs alternatively connected to a pair of side rails.
Claim 2
Dependent Claim
85 words
An acoustical surface wave apparatus as described in claim 1 wherein said interleaved metal electrode pairs comprise a first mated set of electrodes spaced one quarter wavelength apart, said mated set of eLectrodes being connected to a first side rail, and a second mated set of electrodes enclosing said first mated set of electrodes, said second mated set of electrodes being spaced one quarter wavelength from said first mated set of electrodes, said second mated set of electrodes being connected to a second side rail.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |