US2423285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency modulation feed-back circuit for sound recording galvanometers
Assignee: RCA Corp
•
Filing: 1944-11-28
•
Granted: 1947-07-01
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Expires: 1964-11-28
Abstract
No abstract record available.
Inventors
- 👤 Badmaieff Alexis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:06
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1535538A
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US1786436A
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US2024608A
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US2208091A
Cited
US2341706A
Cited
US2321370A
Cited
US2302219A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-30 | 1950-12-30 | 1951-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-30 | 1954-12-30 | 1955-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-30 | 1958-12-30 | 1959-07-01 | $7700.00 | Window Closed / Lapsed |