Patent US2619829A successfully refreshed from Google Patents.
US2619829A
Expired / Lapsed
US
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Interlocking hollow building block
Assignee: Individual
•
Filing: 1948-06-22
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Granted: 1952-12-02
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Expires: 1968-06-22
Abstract
No abstract record available.
Inventors
- 👤 Bethel L Tatum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:43
CPC Classifications
E; E04; E04B; E04B2/00; E04B2/02; E04B2/14; E04B2002/0295
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US460177A
Cited
US729023A
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US950140A
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GB166623A
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GB176031A
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FR527585A
Cited
US1449529A
Cited
US1578091A
Cited
US1571849A
Cited
US1902178A
Cited
US1844828A
Cited
US1794572A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-02 | 1956-06-02 | 1956-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-02 | 1960-06-02 | 1960-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-02 | 1964-06-02 | 1964-12-02 | $7700.00 | Window Closed / Lapsed |