US3773682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of metal-containing materials by gel-precipitation
Assignee: United Kingdom Atomic Energy Authority
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Filing: 1972-01-27
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Granted: 1973-11-20
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Expires: 1992-01-27
Abstract
Abstract In a gel-precipitation process for the production of ceramic microspheres a solution containing a metal salt is mixed with a polyacrylamide compound which acts as a gelating agent and with formamide which acts as a modifying agent to form a homogeneous mixture which is introduced drop-wise into an aqueous alkaline solution in which the drops are converted individually into solid gel spheres.
Inventors
- 👤 A Marshall
- 👤 G Holburt
- 👤 E Lane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:43
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/02; B01J2/06; B01J2/08; G; G21; G21C; G21C3/00; G21C3/42; G21C3/58; G21C3/62; G21C3/623; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
21 words
A gel precipitation process as claimed in claim 1 wherein the solution of at least one metal salt comprises uranium nitrate.
Claim 2
Dependent Claim
21 words
A gel precipitation process as claimed in claim 1 wherein the solution of at least one metal salt comprises plutonium nitrate.
Claim 3
Dependent Claim
19 words
A gel precipitation process as claimed in claim 2 wherein the solution also includes thorium nitrate or plutonium nitrate.
Claim 4
Dependent Claim
23 words
A gel precipitation process as claimed in claim 1 wherein carbon is added to the mixture before introduction into the aqueous alkaline solution.
Claim 5
Dependent Claim
22 words
A gel precipitation process as claimed in claim 1 wherein the polyacrylamide compound has an average molecular weight of 4 X 106.
Claim 6
Dependent Claim
20 words
A gel precipitation process as claimed in claim 1 wherein the solution of at least one metal salt is anion-deficient.
Claim 7
Dependent Claim
22 words
A gel precipitation process as claimed in claim 1 wherein a further gelating agent is included in addition to the polyacrylamide compound.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |