US2472760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrode for electron discharge devices
Assignee: GTE Sylvania Inc
•
Filing: 1943-12-30
•
Granted: 1949-06-07
•
Expires: 1963-12-30
Abstract
No abstract record available.
Inventors
- 👤 Harry L Ratchford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:58
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/28; H01J19/38; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0015; H01J2893/0019; H01J2893/0022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1719774A
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US1566534A
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US1096655A
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US1346192A
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US1236383A
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US1342801A
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US1407525A
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GB407658A
Cited
US2032694A
Cited
US2183635A
Cited
US2395313A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-06 | 1952-12-06 | 1953-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-06 | 1956-12-06 | 1957-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-06 | 1960-12-06 | 1961-06-07 | $7700.00 | Window Closed / Lapsed |