US5164005A
Expired / Lapsed
US
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Black manganese/iron oxide pigment a process for its production and its use
Assignee: Lanxess Deutschland GmbH
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Filing: 1992-03-18
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Granted: 1992-11-17
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Expires: 2012-03-18
Abstract
Abstract A black manganese/iron oxide pigment having a spinel structure and having the composition Mn x Fe 3-x O 4 wherein x has a value from 0.1 to 0.9, is prepared by the steps: a) oxidizing iron(II) salts or mixtures of iron(II) salts and manganese(II) salts, in solution or after reaction with alkaline precipitants, with manganese dioxide or other compounds containing manganese in high valency, b) additionally oxidizing the salts of (a) to establish an Fe(III) content therein with another oxidizing agent, and c) filtering, washing, drying and grinding the pigment; and the pigment is useful for pigmenting building materials to a black color.
Inventors
- 👤 Peter Kuske
- 👤 Gunter Buxbaum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:31
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/22; C01; C01G; C01G49/00; C04; C04B; C04B14/00; C04B14/02; C04B14/30; C01P; C01P2002/00; C01P2002/30; C01P2002/32; C04B2103/00; C04B2103/54
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
35 words
Black pigment consisting of a mixed oxide of manganese and iron of the general composition Mn x Fe 3-x O 4 and having a spinel structure wherein the value of x is 0.1 to 0.9.
Claim 2
Dependent Claim
35 words
Black pigment consisting of a mixed oxide of manganese and iron of the general composition Mn x Fe 3-x O 4 and having a spinel structure wherein the value of x is 0.1 to 0.9.
Claim 3
Dependent Claim
19 words
Black pigment as claimed in claim 1, having a specific surface area of 3 to 15 m 2 /g.
References Cited (Backward Citations)
US4680130A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-11-17 | 1996-05-18 | 1996-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-17 | 2000-05-18 | 2000-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-17 | 2004-05-18 | 2004-11-17 | $7700.00 | Window Closed / Lapsed |