Patent US2990027A successfully refreshed from Google Patents.
US2990027A
Expired / Lapsed
US
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Composite sound absorber
Assignee: Celotex Corp
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Filing: 1957-07-11
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Granted: 1961-06-27
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Expires: 1977-07-11
Abstract
No abstract record available.
Inventors
- 👤 Hale J Sabine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:20
CPC Classifications
E; E04; E04B; E04B9/00; E04B9/04; E04B9/045; E04B9/001; E04B9/0457; E04B9/0471
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2028272A
Cited
US2060241A
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US2142463A
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US2240326A
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US2308869A
Cited
FR1021927A
Cited
FR64385E
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GB768826A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |