US2424633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic reservoir for use in a magnetic sound recording and reproducing system
Assignee: INTERVAL INSTR Inc
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Filing: 1944-05-19
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Granted: 1947-07-29
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Expires: 1964-05-19
Abstract
No abstract record available.
Inventors
- 👤 Rieber Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:51
CPC Classifications
G; G10; G10K; G10K15/00; G10K15/08; G10K15/10; G11; G11B; G11B5/00; Y; Y10; Y10S; Y10S84/00; Y10S84/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-07-28 | 1951-01-27 | 1951-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-28 | 1955-01-27 | 1955-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-28 | 1959-01-27 | 1959-07-29 | $7700.00 | Window Closed / Lapsed |