Patent US3040256A successfully refreshed from Google Patents.
US3040256A
Expired / Lapsed
US
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Selective signaling system with narrow band feedback
Assignee: AT&T Inc
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Filing: 1958-12-12
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Granted: 1962-06-19
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Expires: 1978-12-12
Abstract
No abstract record available.
Inventors
- 👤 Lee G Bostwick
- 👤 Strack Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:44
CPC Classifications
H; H04; H04W; H04W88/00; H04W88/02; H04W88/022; H04W88/025; H04W88/027; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/1638
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2899547A
Cited
US2244725A
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US2277469A
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US2489202A
Cited
US2602853A
Cited
US2630482A
Cited
US2626384A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-06-18 | 1965-12-18 | 1966-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-18 | 1969-12-18 | 1970-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-18 | 1973-12-18 | 1974-06-19 | $7700.00 | Window Closed / Lapsed |