Patent US2347108A successfully refreshed from Google Patents.
US2347108A
Expired / Lapsed
US
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Call transmitter for telephone signaling systems
Assignee: AT&T Inc
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Filing: 1943-02-05
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Granted: 1944-04-18
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Expires: 1963-02-05
Abstract
No abstract record available.
Inventors
- 👤 Francis A Hubbard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:27
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/26; H04M1/27; H04M1/274
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1947-04-18 | 1947-10-18 | 1948-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-04-18 | 1951-10-18 | 1952-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-04-18 | 1955-10-18 | 1956-04-18 | $7700.00 | Window Closed / Lapsed |