Patent US5419323A successfully refreshed from Google Patents.
US2966549A
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Apparatus for improving intelligence under high ambient noise levels
Assignee: Individual
•
Filing: 1954-04-02
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Granted: 1960-12-27
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Expires: 1974-04-02
Abstract
No abstract record available.
Inventors
- 👤 Lawrence J Fogel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:15
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/10; H04B1/12; G; G10; G10K; G10K11/00; G10K11/16; G10K11/175; G10K11/178; G10K11/1781; G10K11/17821; G10K11/17823; G10K11/1787; G10K11/17873; G10K2210/00; G10K2210/10; G10K2210/108; G10K2210/1081; Y; Y10; Y10S; Y10S367/00; Y10S367/901
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) | 1963-12-27 | 1964-06-27 | 1964-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-27 | 1968-06-27 | 1968-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-27 | 1972-06-27 | 1972-12-27 | $7700.00 | Window Closed / Lapsed |