US2671849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic volume control for alternating current
Assignee: Automatic Electric Laboratories Inc
•
Filing: 1950-11-22
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Granted: 1954-03-09
•
Expires: 1970-11-22
Abstract
No abstract record available.
Inventors
- 👤 Everhard H B Bartelink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:16
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1987470A
Cited
US2232080A
Cited
US2337196A
Cited
US2393921A
Cited
GB583800A
Cited
US2536051A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-08 | 1957-09-07 | 1958-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-08 | 1961-09-07 | 1962-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-08 | 1965-09-07 | 1966-03-09 | $7700.00 | Window Closed / Lapsed |