US3674637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spacer grid for nuclear reactor fuel element assembly
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1969-06-20
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Granted: 1972-07-04
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Expires: 1989-06-20
Abstract
Abstract The invention concerns a spacer grid which maintains each rod of a nuclear reactor fuel elements assembly in a relatively large number of points and has however a low resistance to coolant flow. This grid is formed by interassembled cut-out sheet metal members, each comprising two parallel rectilinear ribbon elements which delimits with narrow corrugated strips quadrangular openings, one of said ribbon being interrupted by a slot along the center line of each opening to permit insertion of another member.
Inventors
- 👤 Jacques Delafosse
- 👤 Jean-Luc Viaud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:30
CPC Classifications
G; G21; G21C; G21C3/00; G21C3/30; G21C3/32; G21C3/34; G21C3/356; G21C3/3563; Y; Y02; Y02E; Y02E30/00; Y02E30/30
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |