US5039587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxide-coated carriers and preparation and use thereof
Assignee: BASF SE
•
Filing: 1989-09-07
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Granted: 1991-08-13
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Expires: 2009-09-07
Abstract
Abstract A novel carrier which is stable and effective over long cycle times (6×10 6 prints), has an iron oxide coating of the formula (FeO) x .Fe 2 O 3 where x=0.1-1 and is obtained by treating steel cores (or balls) with defined small amounts of sulfuric acid of defined concentration, partial oxidation of the cores thus treated and drying at 60°-150° C. at ≦100 mbar.
Inventors
- 👤 Erwin Czech
- 👤 Werner Ostertag
- 👤 Detlef Schulze-Hagenest
- 👤 Franz-Ulrich Schmitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:59
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/10; G03G9/107; G03G9/1075; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
123 words
A carrier which has an iron oxide surface coating of the formula (FeO) x . Fe 2 O 3 (x=0.1-1) on steel cores and is obtainable by treating the steel cores (or balls) with aqueous sulfuric acid using per m 2 of ball surface area from 5×10 -5 to 2.5×10 -4 mol of sulfuric acid, the acid concentration at the start of the treatment being from 10 -2 to 10 -6 mol/l, oxidizing the balls which have been treated with sulfuric acid with oxygen or an oxidizing agent in an amount which corresponds to from 5×10 -5 to 5×10 -4 oxidation equivalent/m 2 of ball surface area, and drying the balls at from 60° to 150° C. under a pressure of ≦100 mbar.
Claim 2
Dependent Claim
123 words
A carrier which has an iron oxide surface coating of the formula (FeO) x . Fe 2 O 3 (x=0.1-1) on steel cores and is obtainable by treating the steel cores (or balls) with aqueous sulfuric acid using per m 2 of ball surface area from 5×10 -5 to 2.5×10 -4 mol of sulfuric acid, the acid concentration at the start of the treatment being from 10 -2 to 10 -6 mol/l, oxidizing the balls which have been treated with sulfuric acid with oxygen or an oxidizing agent in an amount which corresponds to from 5×10 -5 to 5×10 -4 oxidation equivalent/m 2 of ball surface area, and drying the balls at from 60° to 150° C. under a pressure of ≦100 mbar.
Claim 3
Dependent Claim
18 words
The carrier of claim 1, wherein the treatment with sulfuric acid and the oxidation are carried out simultaneously.
Claim 4
Dependent Claim
20 words
The carrier of claim 1, wherein the oxidation is carried out with atmospheric oxygen or with an alkali metal permanganate.
Claim 5
Dependent Claim
20 words
The carrier of claim 1, wherein the steel cores (or balls) have been produced by the technique of spray atomizing.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-12 | 1995-02-11 | 1995-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-12 | 1999-02-11 | 1999-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-12 | 2003-02-11 | 2003-08-13 | $7700.00 | Window Closed / Lapsed |