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Patent US2520912A successfully refreshed from Google Patents.
US2520912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Building wall of hollow blocks
Assignee: Individual
•
Filing: 1943-10-16
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Granted: 1950-09-05
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Expires: 1963-10-16
Abstract
No abstract record available.
Inventors
- 👤 Frank B Cheney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:21
CPC Classifications
E; E04; E04C; E04C1/00; E04C1/40; E04C1/41
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1114584A
Cited
US1730090A
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US1709035A
Cited
US2138015A
Cited
US2157688A
Cited
US2115264A
Cited
US2316319A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |