Patent US6154168A successfully refreshed from Google Patents.
US2752017A
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Light diffusing ceiling construction
Assignee: NATIONAL ROLLING MILLS Inc A PA Corp
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Filing: —
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Granted: 1956-06-26
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Expires: 1973-06-26
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:50
CPC Classifications
E; E04; E04B; E04B9/00; E04B9/30; E04B9/006; E04B9/04; E04B9/06; E04B9/064; E04B9/12; E04B9/127; E04B9/22; E04B9/225; E04B9/24; E04B9/241; E04B9/26; E04B9/32; E04B2009/0492
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2511764A
Cited
GB191017277A
Cited
US1045297A
Cited
US1870241A
Cited
US1962648A
Cited
US2022078A
Cited
US2160638A
Cited
US2293672A
Cited
GB553815A
Cited
US2398507A
Cited
US2527031A
Cited
GB640811A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-26 | 1959-12-26 | 1960-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-26 | 1963-12-26 | 1964-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-26 | 1967-12-26 | 1968-06-26 | $7700.00 | Window Closed / Lapsed |