US2177847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement adapted to equalize working voltage fluctuations in amplifiers
Assignee: Siemens and Halske AG
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Filing: 1935-12-16
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Granted: 1939-10-31
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Expires: 1955-12-16
Abstract
No abstract record available.
Inventors
- 👤 Tamm Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:02
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/52; H03F1/54; G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/52
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) | 1942-10-30 | 1943-05-01 | 1943-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-10-30 | 1947-05-01 | 1947-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-10-30 | 1951-05-01 | 1951-10-31 | $7700.00 | Window Closed / Lapsed |