Patent US2324797A successfully refreshed from Google Patents.
US2324797A
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US
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Differentiating amplifier
Assignee: AT&T Inc
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Filing: 1941-09-17
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Granted: 1943-07-20
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Expires: 1961-09-17
Abstract
No abstract record available.
Inventors
- 👤 Edward L Norton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:02
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/18; G06G7/184; G06G7/186; H; H03; H03F; H03F3/00; H03F3/50; H03F3/52
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) | 1946-07-19 | 1947-01-18 | 1947-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-07-19 | 1951-01-18 | 1951-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-07-19 | 1955-01-18 | 1955-07-20 | $7700.00 | Window Closed / Lapsed |