Patent US2882559A successfully refreshed from Google Patents.
US2882559A
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Acoustical ceiling
Assignee: DUO FLEX CORP
•
Filing: 1955-04-06
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Granted: 1959-04-21
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Expires: 1975-04-06
Abstract
No abstract record available.
Inventors
- 👤 John E Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:17
CPC Classifications
E; E04; E04B; E04B9/00; E04B9/22; E04B9/24; E04B9/245
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1625637A
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US1931713A
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US2139641A
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GB493571A
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US2242558A
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US2293431A
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US2303271A
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US2318092A
Cited
US2338468A
Cited
CH278208A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-20 | 1962-10-20 | 1963-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-20 | 1966-10-20 | 1967-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-20 | 1970-10-20 | 1971-04-21 | $7700.00 | Window Closed / Lapsed |