Patent US2859504A successfully refreshed from Google Patents.
US2859504A
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US
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Process of making prestressed concrete structures
Assignee: Individual
•
Filing: 1952-06-11
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Granted: 1958-11-11
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Expires: 1972-06-11
Abstract
No abstract record available.
Inventors
- 👤 Francis X Crowley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:28
CPC Classifications
E; E04; E04C; E04C3/00; E04C3/02; E04C3/20; E04C3/26; E04B; E04B1/00; E04B1/62; E04B1/92; E04B1/94
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1818254A
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US2080074A
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FR46379E
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US2185749A
Cited
US2255022A
Cited
US2315895A
Cited
GB557025A
Cited
US2319105A
Cited
FR898076A
Cited
US2596495A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-10 | 1962-05-12 | 1962-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-10 | 1966-05-12 | 1966-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-10 | 1970-05-12 | 1970-11-11 | $7700.00 | Window Closed / Lapsed |