US2473878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric lamp of double spiral convolution
Assignee: General Electric Co
•
Filing: 1947-11-25
•
Granted: 1949-06-21
•
Expires: 1967-11-25
Abstract
No abstract record available.
Inventors
- 👤 Greiner Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:12
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/32; H01J61/327; H01R; H01R33/00; H01R33/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US702314A
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GB268046A
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US1870147A
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US1926552A
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US2117756A
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US2392661A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-20 | 1952-12-20 | 1953-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-20 | 1956-12-20 | 1957-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-20 | 1960-12-20 | 1961-06-21 | $7700.00 | Window Closed / Lapsed |