Patent US2719917A successfully refreshed from Google Patents.
US2719917A
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Precision sweep calibrator
Assignee: AT&T Inc
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Filing: 1952-03-14
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Granted: 1955-10-04
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Expires: 1972-03-14
Abstract
No abstract record available.
Inventors
- 👤 Kenneth L Chapman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:10
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/30; H03B5/32; H03B5/34; H04; H04N; H04N5/00; H04N5/04; H04N5/06; H04N5/067
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1894687A
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US2073459A
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US2121359A
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US2408078A
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US2425600A
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US2477615A
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US2621295A
Cited
US2466044A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-03 | 1959-04-04 | 1959-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-03 | 1963-04-04 | 1963-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-03 | 1967-04-04 | 1967-10-04 | $7700.00 | Window Closed / Lapsed |