US2429933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: AT&T Inc
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Filing: 1945-08-08
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Granted: 1947-10-28
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Expires: 1965-08-08
Abstract
No abstract record available.
Inventors
- 👤 James W Gibson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:43
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/49; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/39; H01J29/45; H01J29/458
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1905724A
Cited
US2065570A
Cited
US2049472A
Cited
US2149977A
Cited
US2140994A
Cited
US2171213A
Cited
US2246328A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-27 | 1951-04-28 | 1951-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-27 | 1955-04-28 | 1955-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-27 | 1959-04-28 | 1959-10-28 | $7700.00 | Window Closed / Lapsed |