Patent US3381345A successfully refreshed from Google Patents.
US3381345A
Expired / Lapsed
US
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Apparatus for producing concrete blocks
Assignee: Individual
•
Filing: 1965-04-13
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Granted: 1968-05-07
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Expires: 1985-04-13
Abstract
No abstract record available.
Inventors
- 👤 Charles L Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:57
CPC Classifications
B; B28; B28B; B28B7/00; B28B7/0064; B28B7/0073; B28B7/0061
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-07 | 1971-11-06 | 1972-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-07 | 1975-11-06 | 1976-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-07 | 1979-11-06 | 1980-05-07 | $7700.00 | Window Closed / Lapsed |