US2576145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Volume expansion system for audio and like amplifiers
Assignee: International Standard Electric Corp
•
Filing: 1947-01-14
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Granted: 1951-11-27
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Expires: 1967-01-14
Abstract
No abstract record available.
Inventors
- 👤 Rudkin Erie Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:02
CPC Classifications
H; H03; H03G; H03G7/00; H03G7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-26 | 1955-05-28 | 1955-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-26 | 1959-05-28 | 1959-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-26 | 1963-05-28 | 1963-11-27 | $7700.00 | Window Closed / Lapsed |