US2750499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuits for ultrasonic delay lines
Assignee: National Research Development Corp UK
•
Filing: 1951-01-08
•
Granted: 1956-06-12
•
Expires: 1971-01-08
Abstract
No abstract record available.
Inventors
- 👤 Newman Edward Arthur
- 👤 Clayden David Oswald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:27
CPC Classifications
G; G11; G11C; G11C21/00; G11C21/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2402916A
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US2416368A
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US2414479A
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US2430139A
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US2545567A
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US2567846A
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US2535266A
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US2641700A
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US2525634A
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US2480038A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |