US4293507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of shaped bodies
Assignee: Ricardo AEA Ltd
•
Filing: 1979-05-17
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Granted: 1981-10-06
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Expires: 1999-05-17
Abstract
Abstract There is disclosed a method for the preparation of a shaped body which includes the step of cold pressing a material to give the shaped body, wherein the material has been prepared by means of a gelation process and not substantially comminuted prior to cold pressing. The shaped body can be heated subsequently to pressing to produce a sintered shaped body. Preferably the material for pressing, prepared by a gelation process and not substantially comminuted, is a selected physical configuration.
Inventors
- 👤 Peter W. Sutcliffe
- 👤 Jim W. Isaacs
- 👤 Robert L. Nelson
- 👤 Colin E. Lyon
- 👤 Brian Stringer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:04
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/51; C04B35/622; C04B35/64
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
42 words
A method for the preparation of a shaped body comprising cold pressing a material consisting essentially of gel particles produced by the gel precipitation process to give the shaped body, wherein the material has not been substantially comminuted prior to cold pressing.
Claim 2
Independent Claim
42 words
A method for the preparation of a shaped body comprising cold pressing a material consisting essentially of gel particles produced by the gel precipitation process to give the shaped body, wherein the material has not been substantially comminuted prior to cold pressing.
Claim 3
Dependent Claim
22 words
A method as claimed in claim 1 wherein the shaped body is heated subsequently to pressing to produce a sintered shaped body.
Claim 4
Dependent Claim
22 words
A method as claimed in claim 1 wherein the material prior to pressing is in the form of a selected physical configuration.
Claim 5
Dependent Claim
19 words
A method as claimed in claim 3 wherein the material prior to pressing comprises a plurality of shaped entities.
Claim 6
Dependent Claim
15 words
A method as claimed in claim 4 wherein the shaped entities are substantially spherical particles.
Claim 7
Dependent Claim
20 words
A method as claimed in claim 1 wherein prior to pressing the product of gelation is subjected to post-gelation treatment.
Claim 8
Dependent Claim
20 words
A method as claimed in claim 6 wherein the product of gelation is subjected to some debonding prior to pressing.
Claim 9
Dependent Claim
33 words
A method as claimed in claim 6 wherein the extent of debonding of the product of gelation is restricted, or debonding is omitted, to produce a material for cold pressing which is compressible.
Claim 10
Dependent Claim
24 words
A method as claimed in claim 6 wherein the product of gelation is substantially completely debonded prior to pressing to give a friable material.
Claim 11
Dependent Claim
34 words
A method as claimed in claim 1 for the preparation of a shaped body including the steps of cold pressing at least partially debonded, substantially spherical particles of gel precipitate into a shaped body.
Claim 12
Dependent Claim
22 words
A method as claimed in claim 1 wherein further debonding is effected after the body has been formed by the cold pressing.
Claim 13
Dependent Claim
16 words
A method as claimed in claim 1 wherein the shaped body is a nuclear fuel pellet.
Claim 14
Dependent Claim
25 words
A method as claimed in claim 12 wherein the nuclear fuel pellet comprises (70% U/30% Th) O 2 or (70% U/30% Pu) O 2 .
Claim 15
Dependent Claim
39 words
A method as claimed in claim 1 wherein the product of gelation is subjected to post-gelation treatment prior to cold pressing and post-gelation treatment is selected and controlled to provide a material having properties substantially optimised for cold pressing.
References Cited (Backward Citations)
US4016226A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-05 | 1985-04-06 | 1985-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-05 | 1989-04-06 | 1989-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-05 | 1993-04-06 | 1993-10-06 | $7700.00 | Window Closed / Lapsed |