Patent US3506089A successfully refreshed from Google Patents.
US3506089A
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Sound absorptive structural block
Assignee: CAMBRIDGE ACOUSTICAL ASSOCIATE
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Filing: 1968-10-25
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Granted: 1970-04-14
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Expires: 1988-10-25
Abstract
No abstract record available.
Inventors
- 👤 Miguel C Junger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:24
CPC Classifications
E; E04; E04C; E04C1/00; E04C1/40; E04C1/41; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/84; E04B1/8404; E04B2001/8457; E04B2001/8476; E04B2001/848; E04B2001/8485; E04B2001/849
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) | 1973-04-13 | 1973-10-13 | 1974-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-13 | 1977-10-13 | 1978-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-13 | 1981-10-13 | 1982-04-14 | $7700.00 | Window Closed / Lapsed |