US2612557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable resistor signal equalization unit
Assignee: RKO RADIO PIETURES Inc
•
Filing: 1949-07-29
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Granted: 1952-09-30
•
Expires: 1969-07-29
Abstract
No abstract record available.
Inventors
- 👤 Willard H Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:25
CPC Classifications
H; H03; H03G; H03G5/00; H03G5/02; H03G5/025; H01; H01C; H01C10/00; H01C10/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US757880A
Cited
US2221977A
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US2303499A
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US2320524A
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US2298987A
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US2343425A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-30 | 1956-03-31 | 1956-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-30 | 1960-03-31 | 1960-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-30 | 1964-03-31 | 1964-09-30 | $7700.00 | Window Closed / Lapsed |