US2439446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control circuit for signal recording and reproducing systems
Assignee: Brush Development Co
•
Filing: 1944-11-29
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Granted: 1948-04-13
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Expires: 1964-11-29
Abstract
No abstract record available.
Inventors
- 👤 Begun Semi Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:19
CPC Classifications
G; G04; G04F; G04F13/00; G04F13/02; G04F13/026; Y; Y10; Y10S; Y10S131/00; Y10S131/908
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) | 1951-04-13 | 1951-10-13 | 1952-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-13 | 1955-10-13 | 1956-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-13 | 1959-10-13 | 1960-04-13 | $7700.00 | Window Closed / Lapsed |