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Patent US2557774A successfully refreshed from Google Patents.
US2557774A
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US
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Electron discharge tube
Assignee: Hartford National Bank and Trust Co
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Filing: 1949-07-28
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Granted: 1951-06-19
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Expires: 1969-07-28
Abstract
No abstract record available.
Inventors
- 👤 Warmoltz Nicolaas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:17
CPC Classifications
H; H01; H01J; H01J13/00; H01J13/02; H01J13/34; H01J13/48; H01J2893/00; H01J2893/0072; H01J2893/0073; H01J2893/0074; H01J2893/0087
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1843495A
Cited
GB360342A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-18 | 1954-12-18 | 1955-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-18 | 1958-12-18 | 1959-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-18 | 1962-12-18 | 1963-06-19 | $7700.00 | Window Closed / Lapsed |