US2100394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reception of frequency modulated waves and circuits therefor
Assignee: AT&T Inc
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Filing: 1936-01-23
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Granted: 1937-11-30
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Expires: 1956-01-23
Abstract
No abstract record available.
Inventors
- 👤 Raymond A Heising
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:05
CPC Classifications
H; H04; H04B; H04B14/00; H04B14/002; H04B14/006; H03; H03D; H03D3/00; H03D3/02; H03D3/06; H03D3/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1940-11-29 | 1941-05-31 | 1941-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-11-29 | 1945-05-31 | 1945-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-11-29 | 1949-05-31 | 1949-11-30 | $7700.00 | Window Closed / Lapsed |