US2619829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interlocking hollow building block
Assignee: Individual
•
Filing: 1948-06-22
•
Granted: 1952-12-02
•
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
2026-10-26 23:08
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
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GB166623A
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GB176031A
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FR527585A
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US1449529A
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US1578091A
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US1571849A
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US1902178A
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US1844828A
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US1794572A
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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 |