Patent US1912983A successfully refreshed from Google Patents.
US1912983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secret telegraph system
Assignee: Siemens and Halske AG
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Filing: 1931-07-16
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Granted: 1933-06-06
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Expires: 1951-07-16
Abstract
No abstract record available.
Inventors
- 👤 Jipp August
- 👤 Rossberg Ehrhard
- 👤 Hettler Eberhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:43
CPC Classifications
H; H04; H04L; H04L9/00; H04L9/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1936-06-05 | 1936-12-05 | 1937-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-06-05 | 1940-12-05 | 1941-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-06-05 | 1944-12-05 | 1945-06-06 | $7700.00 | Window Closed / Lapsed |