US4712015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shields for nuclear reactors
Assignee: National Nuclear Corp Ltd
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Filing: 1985-11-19
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Granted: 1987-12-08
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Expires: 2005-11-19
Abstract
Abstract A roof shield for a nuclear reactor comprises a normally fixed radially outer portion, a radially inner portion rotatable about a vertical axis, and a connection between the inner and outer portions which permits relative angular movement between the portions without loss of containment, the connection comprising a radially inner wall of the outer portion, an upper portion of the inner wall being so arranged that on upward movement of the inner portion the upper wall portion receives substantially no angular movement, the lower end of the upper portion being at a position below the level of the upper surface of the outer portion.
Inventors
- 👤 Garth J. Aspden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:06
CPC Classifications
G; G21; G21C; G21C13/00; G21C13/02; G21C13/06; G21C13/073; G21C9/00; G21C9/001; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
145 words
A roof shield for a nuclear reactor comprising a normally fixed radially outer portion having a radially inner wall, a radially inner portion rotatable about a vertical axis, and a connection between the inner and outer portions which permits relative angular movement between the portions without loss of containment, the connection being on the radially inner side of an upper portion of the radially inner wall of the outer portion, the upper portion of the inner wall being connected to the outer portion only at the lower end of the upper portion and the upper portion being so arranged that on upward movement of the inner portion the upper portion of the inner wall receives substantially no angular movement, the lower end of the upper portion being at a position below the connection and below the level of the upper surface of the outer portion.
Claim 2
Dependent Claim
145 words
A roof shield for a nuclear reactor comprising a normally fixed radially outer portion having a radially inner wall, a radially inner portion rotatable about a vertical axis, and a connection between the inner and outer portions which permits relative angular movement between the portions without loss of containment, the connection being on the radially inner side of an upper portion of the radially inner wall of the outer portion, the upper portion of the inner wall being connected to the outer portion only at the lower end of the upper portion and the upper portion being so arranged that on upward movement of the inner portion the upper portion of the inner wall receives substantially no angular movement, the lower end of the upper portion being at a position below the connection and below the level of the upper surface of the outer portion.
Claim 3
Dependent Claim
50 words
A roof shield as claimed in claim 1, in which the outer portion has top and bottom walls, said radially inner wall connected to the bottom wall such that on said upward movement the top wall moves away from said upper portion which bends in the region of said position.
Claim 4
Dependent Claim
14 words
A roof shield as claimed in claim 1, in which the connection comprises keys.
Claim 5
Dependent Claim
22 words
A roof shield as claimed in claim 1 wherein the connection is below the upper surfaces of the inner and outer portions.
Claim 6
Dependent Claim
112 words
A roof shield for a nuclear reactor comprising a normally fixed radially outer portion having a radially inner wall, a radially inner portion rotatable about a vertical axis, a connection between the inner and outer portions, the connection being on the radially inner side of an upper portion of the radially inner wall, the upper portion of the inner wall being operable as a cantilever from a position below the connection and below the level of an upper surface of the outer portion, such that on upward movement of the inner portion the radially inner wall bends in the region of said position and the connection is maintained without loss of containment.
Claim 7
Dependent Claim
112 words
A roof shield for a nuclear reactor comprising a normally fixed radially outer portion having a radially inner wall, a radially inner portion rotatable about a vertical axis, a connection between the inner and outer portions, the connection being on the radially inner side of an upper portion of the radially inner wall, the upper portion of the inner wall being operable as a cantilever from a position below the connection and below the level of an upper surface of the outer portion, such that on upward movement of the inner portion the radially inner wall bends in the region of said position and the connection is maintained without loss of containment.
Claim 8
Dependent Claim
31 words
A roof shield as claimed in claim 5, in which the connection comprises keys at a level which is below the upper surface of the outer portion and above said position.
References Cited (Backward Citations)
DE1955501A1
Cited
GB1212480A
Cited
DE2359810A1
Cited
US4192717A
Cited
US4050987A
Cited
FR2297482A1
Cited
GB1499291A
Cited
US4078969A
Cited
US4330370A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-07 | 1991-06-08 | 1991-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-07 | 1995-06-08 | 1995-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-07 | 1999-06-08 | 1999-12-08 | $7700.00 | Window Closed / Lapsed |