US1543668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for eliminating noises in high-frequency telephony through power lines
Assignee: DRATHLOSE TELEGRAPHIE M B H HA
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Filing: 1923-04-30
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Granted: 1925-06-30
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Expires: 1943-04-30
Abstract
No abstract record available.
Inventors
- 👤 Gewecke Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:41
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/54; H04B2203/00; H04B2203/54; H04B2203/5429; H04B2203/5437; H04B2203/5441; H04B2203/5462; H04B2203/5466
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) | 1928-06-29 | 1928-12-29 | 1929-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-06-29 | 1932-12-29 | 1933-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-06-29 | 1936-12-29 | 1937-06-30 | $7700.00 | Window Closed / Lapsed |