Patent US3729224A successfully refreshed from Google Patents.
US2476433A
Expired / Lapsed
US
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Hollow reinforced concrete building unit
Assignee: Individual
•
Filing: 1943-07-24
•
Granted: 1949-07-19
•
Expires: 1963-07-24
Abstract
No abstract record available.
Inventors
- 👤 Jr Edward Shinn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:30
CPC Classifications
E; E04; E04C; E04C1/00; E04C1/40; E04C1/41
Claims Analysis
Total Claims: 0
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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) | 1952-07-18 | 1953-01-17 | 1953-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-18 | 1957-01-17 | 1957-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-18 | 1961-01-17 | 1961-07-19 | $7700.00 | Window Closed / Lapsed |