US4053662A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of processing porous metal filters
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1974-06-07
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Granted: 1977-10-11
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Expires: 1994-06-07
Abstract
Abstract A method of processing porous metal filters used for separating isotopes of uranium hexafluoride, so as to improve the mechanical strength and resistance to corrosion of the fiters. The filters are placed in the presence of an aluminum-based cement in a closed heat-resistant and oxidation-resistant vessel, the interior of the vessel is disposed in a inert gas atmosphere and the vessel is heated to between 800° and 1,000° C in a furnace for about 1 hour. The filters are used for separating uranium isotopes.
Inventors
- 👤 Pierre Bergez
- 👤 Roger Lacroix
- 👤 Pierre Plurien
- 👤 Jean-Paul Touboul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:21
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0039; B01D67/0041; B01D67/00411; B01D39/00; B01D39/14; B01D39/20; B01D39/2027; B01D39/2031; B01D39/2034; B01D59/00; B01D59/10; B01D59/12; B01D59/14; B01D71/00; B01D71/02; B01D71/022; B01D71/0223; B01D71/02232; C; C23; C23C; C23C10/00; C23C10/28; C23C10/34; C23C10/36; C23C10/48; B01D2323/00; B01D2323/08; B01D2323/081; B01D2323/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
79 words
A method of processing porous metal filters used for separating isotopes of uranium hexafluoride, so as to improve the mechanical strength and resistance to corrosion of the filters, characterized in that the filters are placed in the presence of an aluminum-based cement in a closed heat-resistant and oxidation-resistant vessel, the interior of the vessel is disposed in an inert gas atmosphere and the vessel is heated to between 800° and 1000° C. in a furnace for about 1 hour.
Claim 2
Independent Claim
79 words
A method of processing porous metal filters used for separating isotopes of uranium hexafluoride, so as to improve the mechanical strength and resistance to corrosion of the filters, characterized in that the filters are placed in the presence of an aluminum-based cement in a closed heat-resistant and oxidation-resistant vessel, the interior of the vessel is disposed in an inert gas atmosphere and the vessel is heated to between 800° and 1000° C. in a furnace for about 1 hour.
Claim 3
Dependent Claim
38 words
A method of processing according to claim 1, characterized in that the cement is a powder containing aluminum or an alloy thereof, a halide which is volatile or can be dissociated into volatile elements, and an inert alumina.
Claim 4
Dependent Claim
39 words
A method according to claim 2, characterized in that the cement contains 49 parts by weight of an aluminum alloy containing 70 parts by weight of nickel, 2 parts by weight of aluminum chloride and 49 parts of alumina.
Claim 5
Dependent Claim
13 words
A method according to claim 3, characterized in that electro-melted alumina is used.
Claim 6
Dependent Claim
16 words
A method according to claim 3, characterized in that particles of non-porous α alumina are used.
Claim 7
Dependent Claim
23 words
A method according to claim 1, characterized in that the processed filters have a total aluminum content of less than 10% by weight.
Claim 8
Dependent Claim
17 words
A method according to claim 1, characterized in that the porous metal filters are porous nickel tubes.
References Cited (Backward Citations)
US3748105A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |