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US2580673A
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Saw-tooth generator and system utilizing it
Assignee: AT&T Inc
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Filing: 1947-11-14
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Granted: 1952-01-01
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Expires: 1967-11-14
Abstract
No abstract record available.
Inventors
- 👤 Robert E Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:30
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/04; H04N5/06; H03; H03K; H03K4/00; H03K4/92
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1928093A
Cited
US2189898A
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US2226459A
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US2231971A
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US2217774A
Cited
US2310197A
Cited
US2391967A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |