US2576129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonemitting electron tube grid
Assignee: Individual
•
Filing: 1944-12-20
•
Granted: 1951-11-27
•
Expires: 1964-12-20
Abstract
No abstract record available.
Inventors
- 👤 Levin Irvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:01
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/28; H01J19/30; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0019; H01J2893/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1370967A
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US1658712A
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US1794315A
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US1639698A
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US1880937A
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US1954353A
Cited
US1953254A
Cited
GB475183A
Cited
US2263164A
Cited
US2417730A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-26 | 1955-05-28 | 1955-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-26 | 1959-05-28 | 1959-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-26 | 1963-05-28 | 1963-11-27 | $7700.00 | Window Closed / Lapsed |