US2592549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anode structure for electron discharge devices
Assignee: AT&T Inc
•
Filing: 1949-08-03
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Granted: 1952-04-15
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Expires: 1969-08-03
Abstract
No abstract record available.
Inventors
- 👤 Sture O Ekstrand
- 👤 Victor L Ronci
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:54
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/28; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0013
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1514898A
Cited
GB262806A
Cited
US1919984A
Cited
US2075639A
Cited
US2464272A
Cited
US2476940A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-15 | 1955-10-15 | 1956-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-15 | 1959-10-15 | 1960-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-15 | 1963-10-15 | 1964-04-15 | $7700.00 | Window Closed / Lapsed |