US2409769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent glow lamp
Assignee: GTE Sylvania Inc
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Filing: 1944-07-28
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Granted: 1946-10-22
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Expires: 1964-07-28
Abstract
No abstract record available.
Inventors
- 👤 William E Leyshon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:05
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/70; H01J61/72; H01J17/00; H01J17/02; H01J17/04; H01J17/06; H01J17/066; H01J61/02; H01J61/12; H01J61/16; H01J2893/00; H01J2893/0064; H01J2893/0065; H01J2893/0066
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1949-10-21 | 1950-04-22 | 1950-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-10-21 | 1954-04-22 | 1954-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-10-21 | 1958-04-22 | 1958-10-22 | $7700.00 | Window Closed / Lapsed |