US2487212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High efficiency modulator
Assignee: Zenith Electronics LLC
•
Filing: 1946-06-19
•
Granted: 1949-11-08
•
Expires: 1966-06-19
Abstract
No abstract record available.
Inventors
- 👤 John F Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:54
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/02; H03F1/04; H03F1/06; H03F1/07
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2210028A
Cited
US2220201A
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US2184571A
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US2224314A
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US2266197A
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US2238236A
Cited
US2379513A
Cited
US2375821A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-07 | 1953-05-09 | 1953-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-07 | 1957-05-09 | 1957-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-07 | 1961-05-09 | 1961-11-08 | $7700.00 | Window Closed / Lapsed |