Patent US2572830A successfully refreshed from Google Patents.
US2572830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine for molding concrete blocks
Assignee: Individual
•
Filing: 1949-05-18
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Granted: 1951-10-30
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Expires: 1969-05-18
Abstract
No abstract record available.
Inventors
- 👤 Frederick T Appleby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:32
CPC Classifications
B; B28; B28B; B28B1/00; B28B1/08; B28B1/10; B28B1/04; B28B7/00; B28B7/10
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) | 1954-10-29 | 1955-04-30 | 1955-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-29 | 1959-04-30 | 1959-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-29 | 1963-04-30 | 1963-10-30 | $7700.00 | Window Closed / Lapsed |