Patent US2463505A successfully refreshed from Google Patents.
US2463505A
Expired / Lapsed
US
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Secret signaling system
Assignee: Tung Sol Lamp Works Inc
•
Filing: 1943-07-27
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Granted: 1949-03-08
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Expires: 1963-07-27
Abstract
No abstract record available.
Inventors
- 👤 Atkins Carl Edward
- 👤 Alexander V Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:45
CPC Classifications
H; H04; H04K; H04K1/00; H04K1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1495470A
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US1771148A
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US1750668A
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US2169374A
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US2279660A
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US2245717A
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US2274184A
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US2301929A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-03-07 | 1952-09-06 | 1953-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-03-07 | 1956-09-06 | 1957-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-03-07 | 1960-09-06 | 1961-03-08 | $7700.00 | Window Closed / Lapsed |