Patent US2556864A successfully refreshed from Google Patents.
US2556864A
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US
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Coated grid for electron discharge tubes
Assignee: General Electric Co
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Filing: 1950-09-27
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Granted: 1951-06-12
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Expires: 1970-09-27
Abstract
No abstract record available.
Inventors
- 👤 Apker Le Roy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:05
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/28; H01J19/30; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0019; H01J2893/002; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12681; Y10T428/12708; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/1284; Y10T428/23; Y10T428/239
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2040530A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-11 | 1954-12-11 | 1955-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-11 | 1958-12-11 | 1959-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-11 | 1962-12-11 | 1963-06-12 | $7700.00 | Window Closed / Lapsed |