Patent US4452733A successfully refreshed from Google Patents.
US4452733A
Expired / Lapsed
US
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Equipment for volume-reducing treatment of radioactive waste
Assignee: Hitachi Ltd
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Filing: 1981-09-10
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Granted: 1984-06-05
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Expires: 2001-09-10
Abstract
Abstract An equipment for the volume-reducing treatment of a radioactive waste is disclosed. The equipment comprises means for drying and milling radioactive waste liquor, waste sludge, waste resin and the like generated from an atomic power plant, means for pelletizing the powder obtained from the drying and milling means and means for charging the pellet thus formed into a drum. The pelletizing means is a roller press consisting of a pair of press rolls, each having plural pockets formed on the surface thereof. Air vent grooves are also formed on the surface of each press roll so as to extend from the pocket in the rotating direction of the roll.
Inventors
- 👤 Susumu Horiuchi
- 👤 Mikio Hirano
- 👤 Satoshi Hirayama
- 👤 Ryoichi Ishikawa
- 👤 Hajime Iinuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:15
CPC Classifications
G; G21; G21F; G21F9/00; G21F9/04; G21F9/06; G21F9/14; Y; Y10; Y10S; Y10S425/00; Y10S425/812
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
56 words
An equipment for the volume-reducing treatment of a radioactive waste, comprising: means for drying said radioactive waste; means for milling said radioactive waste thus dried; and a pelletizer for press-molding said radioactive waste thus milled by press rolls, each having plural pockets on the surface thereof and air vent grooves communicating with each of said pockets.
Claim 2
Dependent Claim
56 words
An equipment for the volume-reducing treatment of a radioactive waste, comprising: means for drying said radioactive waste; means for milling said radioactive waste thus dried; and a pelletizer for press-molding said radioactive waste thus milled by press rolls, each having plural pockets on the surface thereof and air vent grooves communicating with each of said pockets.
Claim 3
Dependent Claim
28 words
The equipment for the volume-reducing treatment of a radioactive waste as defined in claim 1 wherein said drying means and said milling means are a centrifugal membrane dryer.
Claim 4
Dependent Claim
32 words
The equipment for the volume-reducing treatment of a radioactive waste as defined in claim 1 or 2 wherein said air vent grooves are formed in the rotating direction of said press rolls.
Claim 5
Dependent Claim
30 words
The equipment for the volume-reducing treatment of a radioactive waste as defined in claim 1 or 2 wherein the width of said air vent groove is 5 to 15 μm.
Claim 6
Dependent Claim
27 words
The equipment for the volume-reducing treatment of a radioactive waste as defined in claim 3, wherein the width of said air groove is 5 to 15 μm.
Claim 7
Dependent Claim
58 words
The equipment for the volume-reducing treatment of a radioactive waste as defined in claim 1, further including means forming a vacuum chamber around said drying means, said milling means and said pelletizer; a particle filter; means for evacuating gas from said chamber through said filter to maintain a vacuum within said chamber to prevent escape of radioactive material.
Claim 8
Dependent Claim
49 words
An equipment for the volume-reducing treatment of a radioactive waste as defined in claim 1, wherein the pockets in said rolls are arranged in the same pattern and said rolls are interdriven so that respective pockets of the rolls will mate with each other to form an almond-shaped enclosure.
Claim 9
Dependent Claim
42 words
The equipment for the volume-reducing treatment of a radioactive waste as defined in claim 1, wherein air vent grooves are formed on the inner surface of said pockets and communicate with said air vent grooves on the surface of said press rolls.
Claim 10
Dependent Claim
37 words
The equipment for the volume-reducing treatment of a radioactive waste as defined in claim 18, wherein said air vent grooves are formed in both the rotating direction of said press rolls and in the orthogonal direction thereto.
Claim 11
Dependent Claim
63 words
An equipment for the volume-reducing treatment of a radioactive waste, comprising: means for drying said radioactive waste; means for milling said radioactive waste thus dried; and a pelletizer for press-molding said radioactive waste thus milled by press rolls, each having at least two groups of pockets having varying sizes arranged on the surface thereof and air vent grooves formed communicating with said pockets.
Claim 12
Dependent Claim
63 words
An equipment for the volume-reducing treatment of a radioactive waste, comprising: means for drying said radioactive waste; means for milling said radioactive waste thus dried; and a pelletizer for press-molding said radioactive waste thus milled by press rolls, each having at least two groups of pockets having varying sizes arranged on the surface thereof and air vent grooves formed communicating with said pockets.
Claim 13
Dependent Claim
28 words
The equipment for the volume-reducing treatment of a radioactive waste as defined in claim 10 wherein said drying means and said milling means are a centrifugal membrane dryer.
Claim 14
Dependent Claim
59 words
The equipment for the volume-reducing treatment of a radioactive waste as defined in claim 10, further including means forming a vacuum chamber around said drying means, said milling means and said pelletizer; a particle filter; and means for evacuating gas from said chamber through said filter to maintain a vacuum within said chamber to prevent escape of radioactive material.
Claim 15
Dependent Claim
49 words
The equipment for the volume-reducing treatment of a radioactive waste as defined in claim 10, wherein the pockets in said rolls are arranged in the same pattern and said rolls are interdriven so that respective pockets of the rolls will mate with each other to form an almond-shaped enclosure.
Claim 16
Dependent Claim
43 words
The equipment for the volume-reducing treatment of a radioactive waste as defined in claim 10 wherein said pockets comprise three groups of pockets having varying sizes and the length of said pockets in the rotating direction of said press roll is the same.
Claim 17
Dependent Claim
37 words
The equipment for the volume-reducing treatment of a radioactive waste as defined in claim 14 wherein said three groups of pockets have progressively decreasing sizes from the center in the direction of width of said press roll.
References Cited (Backward Citations)
US3799494A
Cited
DE2430972A1
Cited
US4126291A
Cited
US4140470A
Cited
US4234448A
Cited
SU621595A1
Cited
US4290907A
Cited
JPS54103998A
Cited
US4268409A
Cited
US4290908A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |