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US3050713A
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Assignee: AT&T Inc
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Filing: 1959-12-16
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Granted: 1962-08-21
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Expires: 1979-12-16
Abstract
No abstract record available.
Inventors
- 👤 Leon D Harmon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:45
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/34; H03M1/36; H03M1/361
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2720612A
Cited
US2541039A
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US2863139A
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US2817771A
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US2821626A
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US2869110A
Cited
US2987629A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-08-20 | 1966-02-19 | 1966-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-20 | 1970-02-19 | 1970-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-20 | 1974-02-19 | 1974-08-21 | $7700.00 | Window Closed / Lapsed |