US2492619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical discharge tube
Assignee: GTE Sylvania Inc
•
Filing: 1948-01-02
•
Granted: 1949-12-27
•
Expires: 1968-01-02
Abstract
No abstract record available.
Inventors
- 👤 Casellini Ezio Thomas
- 👤 Howard B Sloan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:53
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/02; H01J17/20; H01J61/00; H01J61/70; H01J61/80; Y; Y10; Y10S; Y10S228/00; Y10S228/904
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1649907A
Cited
US2094679A
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US1994306A
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US2121589A
Cited
US2107945A
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US2154542A
Cited
US2237184A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-26 | 1953-06-27 | 1953-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-26 | 1957-06-27 | 1957-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-26 | 1961-06-27 | 1961-12-27 | $7700.00 | Window Closed / Lapsed |