Patent US3057960A successfully refreshed from Google Patents.
US3057960A
Expired / Lapsed
US
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Normalized sound control system
Assignee: AT&T Inc
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Filing: 1961-03-13
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Granted: 1962-10-09
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Expires: 1981-03-13
Abstract
No abstract record available.
Inventors
- 👤 James F Kaiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:11
CPC Classifications
H; H04; H04R; H04R3/00; H04R3/005; H04R27/00; H04R2201/00; H04R2201/40; H04R2201/403
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) | 1965-10-08 | 1966-04-09 | 1966-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-08 | 1970-04-09 | 1970-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-08 | 1974-04-09 | 1974-10-09 | $7700.00 | Window Closed / Lapsed |