Patent US3398811A successfully refreshed from Google Patents.
US3398811A
Expired / Lapsed
US
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Acoustical tile with vibratile membrane extending into fissures
Assignee: United States Gypsum Co
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Filing: 1961-08-28
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Granted: 1968-08-27
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Expires: 1981-08-28
Abstract
No abstract record available.
Inventors
- 👤 Robert E Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:04
CPC Classifications
E; E04; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/84; E04B1/86; E04B2001/8245; E04B2001/8414; E04B2001/8457; E04B2001/8461; E04B2001/8471; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1028; Y10T156/1034; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/26; Y10T428/266
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-27 | 1972-02-26 | 1972-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-27 | 1976-02-26 | 1976-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-27 | 1980-02-26 | 1980-08-27 | $7700.00 | Window Closed / Lapsed |