US2459698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modulation system
Assignee: Farnsworth Research Corp
•
Filing: 1944-11-20
•
Granted: 1949-01-18
•
Expires: 1964-11-20
Abstract
No abstract record available.
Inventors
- 👤 Clyde E Hallmark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:11
CPC Classifications
H; H03; H03C; H03C1/00; H03C1/16; H03C1/18; H03C1/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1410890A
Cited
US1444605A
Cited
US1984451A
Cited
GB433286A
Cited
US2165847A
Cited
US2219449A
Cited
US2192967A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-01-18 | 1952-07-19 | 1953-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-18 | 1956-07-19 | 1957-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-18 | 1960-07-19 | 1961-01-18 | $7700.00 | Window Closed / Lapsed |