Patent US2433813A successfully refreshed from Google Patents.
US2433813A
Expired / Lapsed
US
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Electric discharge tube
Assignee: GTE Sylvania Inc
•
Filing: 1945-08-23
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Granted: 1947-12-30
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Expires: 1965-08-23
Abstract
No abstract record available.
Inventors
- 👤 Robert C Hilliard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:46
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/38; H01J2893/00; H01J2893/0064; H01J2893/0065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1983743A
Cited
US2075355A
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US2072604A
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US2193600A
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US2201166A
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US2269852A
Cited
US2292057A
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US2320949A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-12-29 | 1951-06-30 | 1951-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-29 | 1955-06-30 | 1955-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-29 | 1959-06-30 | 1959-12-30 | $7700.00 | Window Closed / Lapsed |