US2900447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for correcting the effects of disturbances in telegraphic communication
Assignee: Siemens and Halske AG
•
Filing: 1954-09-22
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Granted: 1959-08-18
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Expires: 1974-09-22
Abstract
No abstract record available.
Inventors
- 👤 Hennig Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:09
CPC Classifications
H; H03; H03M; H03M13/00; H03M13/47; H03M13/51
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE22394E
Cited
US1972985A
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US2119196A
Cited
US2153737A
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US2512038A
Cited
US2653996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-17 | 1963-02-16 | 1963-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-17 | 1967-02-16 | 1967-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-17 | 1971-02-16 | 1971-08-18 | $7700.00 | Window Closed / Lapsed |