US2244700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone system
Assignee: AT&T Inc
•
Filing: 1939-09-21
•
Granted: 1941-06-10
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Expires: 1959-09-21
Abstract
No abstract record available.
Inventors
- 👤 Jr Arthur W Horton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:12
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/62; H04; H04M; H04M15/00; H04M15/08; H04M3/00; H04M3/60; H04M3/64
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) | 1944-06-09 | 1944-12-09 | 1945-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-06-09 | 1948-12-09 | 1949-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-06-09 | 1952-12-09 | 1953-06-10 | $7700.00 | Window Closed / Lapsed |