US2865866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spheroidal alumina
Assignee: Universal Oil Products Co
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Filing: 1956-01-06
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Granted: 1958-12-23
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Expires: 1976-01-06
Abstract
No abstract record available.
Inventors
- 👤 Hoekstra James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:07
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/02; B01J2/06; B01J2/08; B01J21/00; B01J21/02; B01J21/04; Y; Y10; Y10S; Y10S502/00; Y10S502/506; Y10S502/509; Y10S502/511
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
IN THE PROCESS OF PREPARING SUBSTANTIALLY SPHERICAL ALUMINA PARTICLES FROM A SOL CONTAINING ALUMINUM AND CHLORIDE IONS, THE STEP WHICH COMPRISES AGING THE ALUMINA SPHERES IN A BASIC MEDIUM CONTAINING AT LEAST 1.0 EQUIVALENTS OF A BASE SELECTED FROM THE GROUP CONSISTING OF AMMONIA AND ALKYL AMINES FOR EACH EQUIVALENT OF CHLORIDE IN THE SOL, FOR A TIME SUFFICIENT TO ABSORB AT LEAST 1.0 EQUIVALENTS OF SAID BASE.
Claim 2
Dependent Claim
68 words
IN THE PROCESS OF PREPARING SUBSTANTIALLY SPHERICAL ALUMINA PARTICLES FROM A SOL CONTAINING ALUMINUM AND CHLORIDE IONS, THE STEP WHICH COMPRISES AGING THE ALUMINA SPHERES IN A BASIC MEDIUM CONTAINING AT LEAST 1.0 EQUIVALENTS OF A BASE SELECTED FROM THE GROUP CONSISTING OF AMMONIA AND ALKYL AMINES FOR EACH EQUIVALENT OF CHLORIDE IN THE SOL, FOR A TIME SUFFICIENT TO ABSORB AT LEAST 1.0 EQUIVALENTS OF SAID BASE.
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) | 1961-12-22 | 1962-06-23 | 1962-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-22 | 1966-06-23 | 1966-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-22 | 1970-06-23 | 1970-12-23 | $7700.00 | Window Closed / Lapsed |