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US2686843A
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Assignee: AT&T Inc
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Filing: 1951-04-26
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Granted: 1954-08-17
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Expires: 1971-04-26
Abstract
No abstract record available.
Inventors
- 👤 Jr William L Shafer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:36
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/42; H04M3/50; H04M3/51; H04M3/523
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1337681A
Cited
US1861754A
Cited
US2059596A
Cited
US2249486A
Cited
US2361313A
Cited
US2467457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-16 | 1958-02-15 | 1958-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-16 | 1962-02-15 | 1962-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-16 | 1966-02-15 | 1966-08-17 | $7700.00 | Window Closed / Lapsed |