Patent US2528643A successfully refreshed from Google Patents.
US2528643A
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US
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Process and apparatus for molding porous concrete products
Assignee: Individual
•
Filing: 1949-11-23
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Granted: 1950-11-07
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Expires: 1969-11-23
Abstract
No abstract record available.
Inventors
- 👤 Dubbs Carbon Chatley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:01
CPC Classifications
B; B28; B28B; B28B3/00; B28B3/003; B28B7/00; B28B7/28; B28B7/30; B28B7/32; B28B7/40; B28B7/46; Y; Y10; Y10S; Y10S264/00; Y10S264/50; Y10S425/00; Y10S425/119
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-06 | 1954-05-08 | 1954-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-06 | 1958-05-08 | 1958-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-06 | 1962-05-08 | 1962-11-07 | $7700.00 | Window Closed / Lapsed |