Patent US2530140A successfully refreshed from Google Patents.
US2530140A
Expired / Lapsed
US
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Secret signaling system
Assignee: Tung Sol Lamp Works Inc
•
Filing: 1944-08-11
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Granted: 1950-11-14
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Expires: 1964-08-11
Abstract
No abstract record available.
Inventors
- 👤 Atkins Carl Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:52
CPC Classifications
H; H04; H04K; H04K1/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1665328A
Cited
US1573983A
Cited
US1708518A
Cited
GB288714A
Cited
US2175270A
Cited
US2199634A
Cited
US2294129A
Cited
US2272999A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-13 | 1954-05-15 | 1954-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-13 | 1958-05-15 | 1958-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-13 | 1962-05-15 | 1962-11-14 | $7700.00 | Window Closed / Lapsed |