Patent US2776471A successfully refreshed from Google Patents.
US2776471A
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Method of erecting prestressed floor sections
Assignee: Preload Co Inc
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Filing: 1952-01-09
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Granted: 1957-01-08
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Expires: 1972-01-09
Abstract
No abstract record available.
Inventors
- 👤 Dobell Curzon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:25
CPC Classifications
E; E04; E04B; E04B5/00; E04B5/02; E04B5/08; E04B1/00; E04B1/02; E04B1/04; E04B1/06; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/49874
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US500208A
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US685223A
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US1028578A
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US1553157A
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US1971093A
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US1959653A
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US2078329A
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US2215975A
Cited
GB556570A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-08 | 1960-07-09 | 1961-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-08 | 1964-07-09 | 1965-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-08 | 1968-07-09 | 1969-01-08 | $7700.00 | Window Closed / Lapsed |