Patent US3381246A successfully refreshed from Google Patents.
US3381246A
Expired / Lapsed
US
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Distributed transducer ultrasonic delay line and coupling apparatus
Assignee: United States Department of the Air Force
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Filing: 1964-10-08
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Granted: 1968-04-30
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Expires: 1984-10-08
Abstract
No abstract record available.
Inventors
- 👤 Bernard D Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:32
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2815490A
Cited
US2806155A
Cited
US3012203A
Cited
US2921134A
Cited
US3321738A
Cited
US3310761A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |