US2458030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective signaling apparatus and system
Assignee: AT&T Inc
•
Filing: 1944-08-29
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Granted: 1949-01-04
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Expires: 1964-08-29
Abstract
No abstract record available.
Inventors
- 👤 Wilton T Rea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:26
CPC Classifications
H; H04; H04L; H04L21/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB355705A
Cited
US1938899A
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US2053156A
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US2099065A
Cited
US2210576A
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US2267827A
Cited
US2275017A
Cited
US2361766A
Cited
US2407320A
Cited
US2381920A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-01-04 | 1952-07-05 | 1953-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-04 | 1956-07-05 | 1957-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-04 | 1960-07-05 | 1961-01-04 | $7700.00 | Window Closed / Lapsed |