Patent US2389084A successfully refreshed from Google Patents.
Patent US3263444A successfully refreshed from Google Patents.
US2975853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound absorbent translucent building block
Assignee: Individual
•
Filing: 1957-11-07
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Granted: 1961-03-21
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Expires: 1977-11-07
Abstract
No abstract record available.
Inventors
- 👤 Albert W Friend
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:12
CPC Classifications
E; E04; E04C; E04C1/00; E04C1/42; E04B; E04B1/00; E04B1/62; E04B1/74; E04B1/82; E04B1/84; E04B1/8404; E04B2001/742; E04B2001/747; E04B2001/748; E04B2001/8423; E04B2001/8428; E04B2001/8433; E04B2001/8452
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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Cited
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Cited
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FR1136944A
Cited
US2870857A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |