Patent US2597739A successfully refreshed from Google Patents.
US2597739A
Expired / Lapsed
US
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Electric lighting fixture for elongated tubular lamps
Assignee: Lighting Products Inc
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Filing: 1948-06-07
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Granted: 1952-05-20
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Expires: 1968-06-07
Abstract
No abstract record available.
Inventors
- 👤 Kenneth B Lacy
- 👤 William E Janness
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:42
CPC Classifications
F; F21; F21S; F21S8/00; F21S8/04; F21V; F21V17/00; F21Y; F21Y2103/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2291490A
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US2270814A
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US2331774A
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US2327568A
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US2321099A
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US2393062A
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US2364992A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-20 | 1955-11-19 | 1956-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-20 | 1959-11-19 | 1960-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-20 | 1963-11-19 | 1964-05-20 | $7700.00 | Window Closed / Lapsed |