Patent US2851874A successfully refreshed from Google Patents.
US2851874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced concrete building construction
Assignee: Individual
•
Filing: 1952-12-29
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Granted: 1958-09-16
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Expires: 1972-12-29
Abstract
No abstract record available.
Inventors
- 👤 John A Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:27
CPC Classifications
E; E04; E04B; E04B2/00; E04B2/84; E04B2/86; E04B2/8652; E04B2002/867
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB375162A
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FR735134A
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US1991550A
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US2029082A
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US2104874A
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US2104873A
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US2257598A
Cited
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Cited
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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) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |