US2555089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct-indirect fluorescent luminaire
Assignee: Individual
•
Filing: 1945-09-01
•
Granted: 1951-05-29
•
Expires: 1965-09-01
Abstract
No abstract record available.
Inventors
- 👤 Keefer William Hobart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:38
CPC Classifications
F; F21; F21S; F21S8/00; F21S8/04; F21S8/06; F21V; F21V17/00; F21V19/00; F21V19/04; F21Y; F21Y2103/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2232499A
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US2271679A
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US2268731A
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US2293117A
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US2346717A
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US2349102A
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US2365614A
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US2391325A
Cited
US2376801A
Cited
US2390807A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-28 | 1954-11-27 | 1955-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-28 | 1958-11-27 | 1959-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-28 | 1962-11-27 | 1963-05-29 | $7700.00 | Window Closed / Lapsed |