US2836657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secrecy communication system
Assignee: General Electric Co
•
Filing: 1944-11-20
•
Granted: 1958-05-27
•
Expires: 1964-11-20
Abstract
No abstract record available.
Inventors
- 👤 Everhard H B Bartelink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:21
CPC Classifications
H; H04; H04K; H04K1/00; H04K1/06; H04J; H04J3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US725636A
Cited
US1461783A
Cited
US1598673A
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US1526335A
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US1561273A
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US1613686A
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US1709901A
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US1802745A
Cited
US1976393A
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US1869659A
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US2101224A
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US2107756A
Cited
US2262838A
Cited
US2199634A
Cited
US2352634A
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US2213320A
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US2312897A
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GB541665A
Cited
US2326515A
Cited
US2406851A
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US2412964A
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US2429608A
Cited
US2405252A
Cited
GB558343A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-26 | 1961-11-25 | 1962-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-26 | 1965-11-25 | 1966-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-26 | 1969-11-25 | 1970-05-27 | $7700.00 | Window Closed / Lapsed |