Patent US2534535A successfully refreshed from Google Patents.
US2534535A
Expired / Lapsed
US
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Secrecy system
Assignee: RCA Corp
•
Filing: 1942-12-07
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Granted: 1950-12-19
•
Expires: 1962-12-07
Abstract
No abstract record available.
Inventors
- 👤 Smith J Ernest
- 👤 Richard E Mathes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:10
CPC Classifications
H; H04; H04K; H04K1/00; H04K1/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2061734A
Cited
US2227108A
Cited
US2113214A
Cited
US2266401A
Cited
US2272070A
Cited
US2298562A
Cited
GB541665A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-18 | 1954-06-19 | 1954-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-18 | 1958-06-19 | 1958-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-18 | 1962-06-19 | 1962-12-19 | $7700.00 | Window Closed / Lapsed |