Patent US3716210A successfully refreshed from Google Patents.
US3716210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pc concrete pipe reinforcement structure
Assignee: Nippon Concrete Industries Co Ltd
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Filing: 1971-01-18
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Granted: 1973-02-13
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Expires: 1991-01-18
Abstract
Abstract MENTS, AND CAGE SHAPED BODIES AROUND THE FREELY MOVABLE BODY AND ATTACHED TO THE FITTINGS. PC CONCRETE PIPE REINFORCEMENT HAVING TENSIONED VERTICAL REINFORCEMENTS ATTACHED TO END FITTINGS, FREELY MOVABLE CAGE SHAPED BODIES WITHIN THE TENSION REINFORCE-
Inventors
- 👤 Y Fukushima
- 👤 Y Usui
- 👤 T Sakumura
- 👤 Y Ishihara
- 👤 K Momota
- 👤 S Sogo
- 👤 K Nunokawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:25
CPC Classifications
B; B21; B21F; B21F27/00; B21F27/12; B21F27/121; B28; B28B; B28B21/00; B28B21/56; B28B21/60; E; E04; E04C; E04C5/00; E04C5/01; E04C5/06; E04C5/0604; E04C5/0618
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |