US2504307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hand telephone
Assignee: AT&T Inc
•
Filing: 1945-08-24
•
Granted: 1950-04-18
•
Expires: 1965-08-24
Abstract
No abstract record available.
Inventors
- 👤 Dalton John Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:15
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/03; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18992
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1352939A
Cited
US1298217A
Cited
US1341358A
Cited
US2039625A
Cited
US2066092A
Cited
US2301184A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-17 | 1953-10-17 | 1954-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-17 | 1957-10-17 | 1958-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-17 | 1961-10-17 | 1962-04-18 | $7700.00 | Window Closed / Lapsed |