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Patent US2477381A successfully refreshed from Google Patents.
US2477381A
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Reinforced cementitious hollow building wall
Assignee: R C LEWIS
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Filing: 1943-12-27
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Granted: 1949-07-26
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Expires: 1963-12-27
Abstract
No abstract record available.
Inventors
- 👤 Henry R Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:43
CPC Classifications
E; E04; E04B; E04B2/00; E04B2/84; E04B2/842; E04B2/845; E04B2/72; E04B2/723
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1300439A
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US1302822A
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US1877898A
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US1930984A
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US2189820A
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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) | 1952-07-25 | 1953-01-24 | 1953-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-07-25 | 1957-01-24 | 1957-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-07-25 | 1961-01-24 | 1961-07-26 | $7700.00 | Window Closed / Lapsed |