US2440320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modulation system
Assignee: STC PLC
•
Filing: 1944-03-13
•
Granted: 1948-04-27
•
Expires: 1964-03-13
Abstract
No abstract record available.
Inventors
- 👤 Jr Norman H Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:19
CPC Classifications
H; H03; H03K; H03K7/00; H03K7/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1597323A
Cited
US1438988A
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US2027054A
Cited
US2061734A
Cited
US2284444A
Cited
US2284401A
Cited
US2311796A
Cited
US2289564A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-27 | 1951-10-27 | 1952-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-27 | 1955-10-27 | 1956-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-27 | 1959-10-27 | 1960-04-27 | $7700.00 | Window Closed / Lapsed |