US2519247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Timing circuit
Assignee: AT&T Inc
•
Filing: 1947-12-31
•
Granted: 1950-08-15
•
Expires: 1967-12-31
Abstract
No abstract record available.
Inventors
- 👤 William H T Holden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:53
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/13; H03K17/00; H03K17/28; H03K17/288
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1552321A
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US2053016A
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US2003992A
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US2313906A
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US2264873A
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US2300999A
Cited
US2306237A
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US2327791A
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US2383822A
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US2477770A
Cited
US2434101A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-14 | 1954-02-13 | 1954-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-14 | 1958-02-13 | 1958-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-14 | 1962-02-13 | 1962-08-15 | $7700.00 | Window Closed / Lapsed |