Patent US3951679A successfully refreshed from Google Patents.
US3951679A
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US
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Colored pigments
Assignee: Merck Patent GmbH
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Filing: 1974-03-15
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Granted: 1976-04-20
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Expires: 1994-03-15
Abstract
Abstract Blue colored mica flake pigments are provided by coating mica flakes, or mica flakes optionally coated with a uniform metallic oxide layer, with a uniform layer of a low-solubility iron compound convertible into Berlin blue [ferric hexacyanoferrate(II)], and then converting this layer into Berlin blue.
Inventors
- 👤 Horst Bernhard
- 👤 Alfred Stein
- 👤 Reiner Esselborn
- 👤 Reiner Hesse
- 👤 Horst Russmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:15
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/18; A61K8/19; A61K8/26; A61K8/02; A61K8/11; A61Q; A61Q1/00; A61Q1/02; C; C09; C09C; C09C1/00; C09C1/0015; C09C1/0021; A61K2800/00; A61K2800/40; A61K2800/41; A61K2800/412; A61K2800/42; A61K2800/43; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/12; C09C2200/00; C09C2200/10; C09C2200/102; C09C2200/30; C09C2200/301; C09C2200/302; C09C2200/306; C09C2200/40; C09C2200/401; C09C2220/00; C09C2220/10; C09C2220/103
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
20 words
A colored mica flake pigment having a layer of ferric hexacyanoferrate(II) on the mica flakes as a color-imparting uniform coating.
Claim 2
Dependent Claim
20 words
A colored mica flake pigment having a layer of ferric hexacyanoferrate(II) on the mica flakes as a color-imparting uniform coating.
Claim 3
Dependent Claim
34 words
A blue pigment according to claim 1 containing, as its sole colored layer, up to 25% by weight of ferric hexacyanoferrate(II) as a coating of a uniform thickness of about 0.1 to 150 nm.
Claim 4
Dependent Claim
28 words
A pigment according to claim 1 wherein the mica flakes have a uniform coating of TiO 2 or ZrO 2 or a hydrate thereof beneath the ferric hexacyanoferrate.
Claim 5
Dependent Claim
16 words
A pigment according to claim 3 wherein the coating beneath the ferric hexacyanoferrate(II) is titanium dioxide.
Claim 6
Dependent Claim
18 words
A pigment according to claim 1 wherein the ferric hexacyanoferrate(II) is the sole coating on the mica flakes.
Claim 7
Dependent Claim
47 words
A pigment according to claim 1 wherein the mica flakes have a diameter of 5-50 microns and a thickness of about 0.5 microns and are uniformly coated with a layer of 50-300 mg. of titanium dioxide per square meter of surface beneath the layer of ferric hexacyanoferrate(II).
Claim 8
Dependent Claim
25 words
A pigment according to claim 2 containing 1-15% by weight of ferric hexacyanoferrate(II) as a layer of a thickness of from 1 to 70 nm.
Claim 9
Dependent Claim
11 words
A cosmetic preparation containing therein a pigment according to claim 1.
Claim 10
Dependent Claim
31 words
A cosmetic preparation according to claim 8 wherein the preparation is eyeshadow in stick, pressed powder or liquid form, containing about 5-15%, 20-70% and 7-15% by weight, respectively, of the pigment.
References Cited (Backward Citations)
US3711308A
Cited
US3874890A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-20 | 1979-10-20 | 1980-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-20 | 1983-10-20 | 1984-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-20 | 1987-10-20 | 1988-04-20 | $7700.00 | Window Closed / Lapsed |