US1729983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplifier system
Assignee: Associated Electrical Industries Ltd
•
Filing: 1924-06-02
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Granted: 1929-10-01
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Expires: 1944-06-02
Abstract
No abstract record available.
Inventors
- 👤 Brown Walter John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:26
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/02; H03G3/14; H03G3/16
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) | 1932-09-30 | 1933-04-01 | 1933-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-09-30 | 1937-04-01 | 1937-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-09-30 | 1941-04-01 | 1941-10-01 | $7700.00 | Window Closed / Lapsed |