US3764470A
Expired / Lapsed
US
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Flow twister
Assignee: Combustion Engineering Inc
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Filing: 1971-01-04
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Granted: 1973-10-09
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Expires: 1991-01-04
Abstract
Abstract A flow twister for the cooling fluid flowing longitudinally in channels between spaced parallel nuclear reactor fuel elements positioned laterally by intersecting grid members. The twister is a U-shaped metal sheet straddling one grid member at an intersection. the free ends of the U are folded on themselves and form two pairs of oppositely directed spirals and a pair slots receiving the other grid member. The sheet is allotted in alignment with the pair of slots. The twisters direct cooling fluid inwardly toward and spirally around the adjacent fuel rod.
Inventors
- 👤 J Calvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:04
CPC Classifications
G; G21; G21C; G21C3/00; G21C3/30; G21C3/32; G21C3/322; G21C15/00; G21C15/02; G21C15/04; 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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |