UST911015I4
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nuclear core positioning system
Assignee: —
•
Filing: 1971-12-21
•
Granted: 1973-06-26
•
Expires: 1991-12-21
Abstract
Abstract A STRUCTURAL SUPPORT SYSTEM FOR THE CORE OF A NUCLEAR REACTOR WHICH ACHIEVES RELATIVELY RESTRICTED CLEARANCES AT OPERATING CONDITIONS AND YET ALLOWS SUFFICIENT CLEARANCE BETWEEN FUEL ASSEMBLIES AT REFUELING TEMPERATURS. AXIALLY DISPLACED SPACER PADS HAVING VARIABLE BETWEEN PAD SPACING AND A TEMPERATURE COMPENSATED RADIAL RESTRAINT SYSTEM ARE UTILIZED TO MAINTAIN CLEARANCES BETWEEN THE FUEL ELEMENTS. THE CORE SUPPORT PLATES ARE CONSTRUCTED OF METALS SPECIALLY CHOSEN SUCH THAT DIFFERENTIAL THERMAL EXPANSION PRODUCES POSITIVE RESTRAINT AT OPERATING TEMPERTURES.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:58
CPC Classifications
G; G21; G21C; G21C1/00; G21C1/02; G21C13/00; G21C13/02; G21C13/04; G21C5/00; G21C5/02; G21C5/08; G21C5/10; 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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |