US2597875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Troffer for fluorescent lighting fixtures readily attached to the framework of a ceiling
Assignee: A L SMITH IRON Co
•
Filing: 1948-06-11
•
Granted: 1952-05-27
•
Expires: 1968-06-11
Abstract
No abstract record available.
Inventors
- 👤 Kruger Michael Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:34
CPC Classifications
F; F21; F21S; F21S8/00; F21S8/02; F21V; F21V21/00; F21Y; F21Y2103/00; F21Y2113/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2028453A
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US2270814A
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US2305015A
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US2335736A
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US2365614A
Cited
US2463057A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-27 | 1955-11-26 | 1956-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-27 | 1959-11-26 | 1960-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-27 | 1963-11-26 | 1964-05-27 | $7700.00 | Window Closed / Lapsed |