US2610294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum tube keying circuit
Assignee: Individual
•
Filing: 1945-06-13
•
Granted: 1952-09-09
•
Expires: 1965-06-13
Abstract
No abstract record available.
Inventors
- 👤 Seddon John Carl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:19
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/80; H04; H04L; H04L27/00; H04L27/02; H04L27/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1868034A
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US1984105A
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US2027038A
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US2329137A
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US2409577A
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US2456016A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-09 | 1956-03-10 | 1956-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-09 | 1960-03-10 | 1960-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-09 | 1964-03-10 | 1964-09-09 | $7700.00 | Window Closed / Lapsed |