US2678486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grid for electron discharge devices
Assignee: AT&T Inc
•
Filing: 1949-10-11
•
Granted: 1954-05-18
•
Expires: 1969-10-11
Abstract
No abstract record available.
Inventors
- 👤 Arthur J Chick
- 👤 Lawrence J Speck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:21
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/28; H01J19/38; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0015; H01J2893/0016
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US535321A
Cited
US1472505A
Cited
US2261350A
Cited
US2610387A
Cited
US2451360A
Cited
US2527127A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-17 | 1957-11-16 | 1958-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-17 | 1961-11-16 | 1962-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-17 | 1965-11-16 | 1966-05-18 | $7700.00 | Window Closed / Lapsed |