US3444323A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic sound volume controlling system
Assignee: TDK Corp
•
Filing: 1965-10-18
•
Granted: 1969-05-13
•
Expires: 1985-10-18
Abstract
No abstract record available.
Inventors
- 👤 Tatsuo Nagashima
- 👤 Fujio Suganuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:09
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2486480A
Cited
US2668874A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-12 | 1972-11-11 | 1973-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-12 | 1976-11-11 | 1977-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-12 | 1980-11-11 | 1981-05-13 | $7700.00 | Window Closed / Lapsed |