US2444676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound recording and reproducing control system
Assignee: Dictaphone Corp
•
Filing: 1944-12-29
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Granted: 1948-07-06
•
Expires: 1964-12-29
Abstract
No abstract record available.
Inventors
- 👤 Frederick W Roberts
- 👤 Roger C Curtis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:18
CPC Classifications
H; H03; H03G; H03G7/00; H03G7/02; H03G1/00; H03G1/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2318624A
Cited
US2359489A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-07-06 | 1952-01-05 | 1952-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-07-06 | 1956-01-05 | 1956-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-07-06 | 1960-01-05 | 1960-07-06 | $7700.00 | Window Closed / Lapsed |