Patent US2556934A successfully refreshed from Google Patents.
US2556934A
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Variable delay circuit
Assignee: Allen B du Mont Laboratories Inc
•
Filing: 1947-10-18
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Granted: 1951-06-12
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Expires: 1967-10-18
Abstract
No abstract record available.
Inventors
- 👤 Jr James H Mulligan
- 👤 Jr Arthur J Talamini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:05
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/04; H04N5/06; H04N5/067; H04N5/0675; H03; H03K; H03K5/00; H03K5/13
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2423931A
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US2272070A
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US2405237A
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US2402916A
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US2431591A
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US2442769A
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US2421018A
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US2418364A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-11 | 1954-12-11 | 1955-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-11 | 1958-12-11 | 1959-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-11 | 1962-12-11 | 1963-06-12 | $7700.00 | Window Closed / Lapsed |