Patent US2659808A successfully refreshed from Google Patents.
US2659808A
Expired / Lapsed
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Combination luminous and acoustical ceiling
Assignee: F W WAKEFIELD BRASS Co
•
Filing: 1949-06-22
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Granted: 1953-11-17
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Expires: 1969-06-22
Abstract
No abstract record available.
Inventors
- 👤 Herbert L Beckwith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:55
CPC Classifications
E; E04; E04B; E04B9/00; E04B9/34; F; F21; F21V; F21V11/00; F21Y; F21Y2103/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1740229A
Cited
US1826133A
Cited
US1937177A
Cited
US1956773A
Cited
US1962648A
Cited
US2153242A
Cited
US2189008A
Cited
US2160638A
Cited
US2218992A
Cited
GB530328A
Cited
US2390262A
Cited
US2502016A
Cited
US2502017A
Cited
US2398507A
Cited
GB593235A
Cited
US2527031A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-16 | 1957-05-18 | 1957-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-16 | 1961-05-18 | 1961-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-16 | 1965-05-18 | 1965-11-17 | $7700.00 | Window Closed / Lapsed |