US2458277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of electric discharge lamps
Assignee: STURDY ELECTRIC Co Ltd
•
Filing: 1947-05-28
•
Granted: 1949-01-04
•
Expires: 1967-05-28
Abstract
No abstract record available.
Inventors
- 👤 Lark Gordon Tremayne Kingsley
- 👤 Davie Robert Boyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:31
CPC Classifications
H; H05; H05B; H05B41/00; H05B41/14; H05B41/36; H05B41/38; H05B41/39; H05B41/391
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2142837A
Cited
US2298589A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-01-04 | 1952-07-05 | 1953-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-04 | 1956-07-05 | 1957-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-04 | 1960-07-05 | 1961-01-04 | $7700.00 | Window Closed / Lapsed |