Patent US1568979A successfully refreshed from Google Patents.
US1568979A
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Oscillation generator
Assignee: AT&T Inc
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Filing: 1921-09-03
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Granted: 1926-01-12
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Expires: 1941-09-03
Abstract
No abstract record available.
Inventors
- 👤 Vern O Knudsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:20
CPC Classifications
H; H03; H03J; H03J3/00; H03J3/02; H03J3/06; H03J3/08
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) | 1929-01-11 | 1929-07-13 | 1930-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1933-01-11 | 1933-07-13 | 1934-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1937-01-11 | 1937-07-13 | 1938-01-12 | $7700.00 | Window Closed / Lapsed |