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Patent US2523581A successfully refreshed from Google Patents.
US2523581A
Expired / Lapsed
US
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Fluorescent lighting fixture
Assignee: Individual
•
Filing: 1945-03-17
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Granted: 1950-09-26
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Expires: 1965-03-17
Abstract
No abstract record available.
Inventors
- 👤 Margolis Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:14
CPC Classifications
F; F21; F21S; F21S8/00; F21Y; F21Y2103/00; F21Y2113/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2221954A
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GB523028A
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US2251024A
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US2358784A
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US2249318A
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US2335545A
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US2345235A
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US2321099A
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US2338077A
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US2352804A
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US2365614A
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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) | 1953-09-25 | 1954-03-27 | 1954-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-25 | 1958-03-27 | 1958-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-25 | 1962-03-27 | 1962-09-26 | $7700.00 | Window Closed / Lapsed |