US3447784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for prestressing concrete
Assignee: IND DE TRAVAUX CIE
•
Filing: 1966-01-03
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Granted: 1969-06-03
•
Expires: 1986-01-03
Abstract
No abstract record available.
Inventors
- 👤 Pierre Launay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:09
CPC Classifications
B; B28; B28B; B28B23/00; B28B23/02; B28B23/04; B28B23/046; E; E04; E04C; E04C5/00; E04C5/08; E04C5/12; E04G; E04G21/00; E04G21/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2270240A
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US2728978A
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DE879293C
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US2763464A
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GB764197A
Cited
US2988794A
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FI32183A
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US3137971A
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US3176961A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-02 | 1972-12-02 | 1973-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-02 | 1976-12-02 | 1977-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-02 | 1980-12-02 | 1981-06-03 | $7700.00 | Window Closed / Lapsed |