Patent US3568379A successfully refreshed from Google Patents.
US3568379A
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Prestressed concrete pressure vessel
Assignee: Studsvik Energiteknik AB
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Filing: 1968-11-14
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Granted: 1971-03-09
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Expires: 1988-11-14
Abstract
Abstract A PRESTRESSED CONCRETE PRESSURE VESSEL COMPRISES A CONCRETE VESSEL, AXIAL PRESTRESSING CABLE AND CIRCUMFERENTIAL PRESTRESSING CABLES. THE VESSEL HAS A LID AND AN INNER STEEL LINING. THE UPPER PORTION OF THE STEEL LINING IS DESIGNED AS A COMPARATIVELY RIGID STEEL STRUCTURE HAVING A SHOULDER FOR SUPPORTING THE LID AND SHOULDERS FOR FASTENING THE UPPER ENDS OF THE AXIAL PRESTRESSING CABLES.
Inventors
- 👤 Erik Borje Johnsson
- 👤 Taivo Tarandi
- 👤 Per Kurt Luthman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:02
CPC Classifications
F; F16; F16J; F16J13/00; F16J13/02; F16J13/08; E; E04; E04H; E04H7/00; E04H7/02; E04H7/18; E04H7/20; G; G21; G21C; G21C13/00; G21C13/02; G21C13/06; G21C13/073; G21C13/0735; G21C13/08; G21C13/093; G21C13/0933; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |