US2737730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for generating and reproducing electrical signals
Assignee: EMI Ltd
•
Filing: 1951-02-08
•
Granted: 1956-03-13
•
Expires: 1971-02-08
Abstract
No abstract record available.
Inventors
- 👤 Spencer Rolf Edmund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:12
CPC Classifications
G; G09; G09B; G09B9/00; G09B9/02; G09B9/08; G09B9/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2073370A
Cited
US2164297A
Cited
US2240420A
Cited
US2562987A
Cited
US2522528A
Cited
US2539498A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-13 | 1959-09-12 | 1960-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-13 | 1963-09-12 | 1964-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-13 | 1967-09-12 | 1968-03-13 | $7700.00 | Window Closed / Lapsed |