US3862908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microspheres of urania and other materials
Assignee: WR Grace and Co
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Filing: 1967-05-03
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Granted: 1975-01-28
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Expires: 1987-05-03
Abstract
Abstract As compositions of matter non-agglomerating microspheres of oxides in the 5 to 500 micron size range. The particles have a uniform crystallite structure with a grain size of 1 micron or less, and a sigma value derived from the equation Sigma D/Ds of about 1 to 1.3.
Inventors
- 👤 Frederick T Fitch
- 👤 Ann B Braun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:32
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; B; B01; B01J; B01J2/00; B01J2/02; B01J2/06; B01J2/08; C04B35/51; C04B35/622; C04B35/626; G; G21; G21C; G21C3/00; G21C3/42; G21C3/58; G21C3/62; G21C3/623; G21C3/64; Y; Y02; Y02E; Y02E30/00; Y02E30/30; Y10; Y10S; Y10S376/00; Y10S376/90; Y10S376/901
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
60 words
The composition of claim 1 having an unsintered density of 15 to 45 percent of theoretical, volume of water content of less than 60 percent in the green particles and being sinterable to a density of greater than 90 percent of theoretical at a temperature of less than one half the melting point for periods of less than 5 hours.
Claim 2
Dependent Claim
20 words
The composition of claim 1 wherein the actinide oxides are selected from the group consisting of urania, thoria and plutonia.
Claim 3
Dependent Claim
39 words
The composition of claim 1 wherein the ceramic oxides are selected from the group consisting of silica, magnesia, chromia, oxides of iron, cobalt and nickel and oxides of the elements in Groups III, and V in the periodic table.
Claim 4
Dependent Claim
94 words
As compositions of matter microspheres of controlled size in the range of 5 to 500 microns, having a green density of 15 to 45 percent theoretical density consisting essentially of dried colloidal residues selected from the group consisting of actinide oxides, and mixtures thereof, actinide oxides with rare earth oxides, being reactive at low temperatures and sintering readily to essentially theoretical density, said mixed particles having the property of forming solid solution phases and dense products by chemical reactions said particles having a sigma value derived from the equation Sigma D/Ds of about 1.
Claim 5
Dependent Claim
18 words
As compositions of matter microspheres according to claim 5 wherein one of the actinide oxides is uranium oxide.
Claim 6
Dependent Claim
19 words
As a composition of mattEr microspheres according to claim 5 wherein one of the actinide oxides is thorium oxide.
Claim 7
Dependent Claim
19 words
As a composition of matter microspheres according to claim 5 wherein one of the actinide oxides is plutonium oxide.
Claim 8
Dependent Claim
21 words
As a composition of matter microspheres according to claim 5 wherein the actinide oxides are mixtures of thorium and uranium dioxides.
Claim 9
Dependent Claim
17 words
As a composition of matter microspheres according to claim 5 wherein the oxides are rare earth oxides.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |