Patent US5228911A successfully refreshed from Google Patents.
US5228911A
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Oxidized graphite flaky particles and pigments based thereon
Assignee: Merck Patent GmbH
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Filing: 1992-04-17
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Granted: 1993-07-20
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Expires: 2012-04-17
Abstract
Abstract The invention relates to oxidized graphite flaky particles obtainable by oxidizing graphite flaky particles in an oxygen-containing atmosphere at 200°-500° C., by suspending graphite flaky particles in aqueous medium and oxidizing them with a water-soluble oxidizing agent or by oxidizing graphite flaky particles in an oxygen-containing atmosphere, suspending these oxidized particles in an aqueous medium and oxidizing them further with a water-soluble oxidizing agent, and to pigments based thereon.
Inventors
- 👤 Koshiro Kunii
- 👤 Katsuhisa Nitta
- 👤 Kunimitsu Ohira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:20
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/0015; C09C1/0051; A; A61; A61K; A61K8/00; A61K8/02; A61K8/0241; A61K8/0254; A61K8/18; A61K8/19; A61K8/22; A61K8/29; A61Q; A61Q1/00; A61Q1/02; A61Q1/10; C09C1/0018; C09C1/0021; C09C1/44; C09C1/46; A61K2800/00; A61K2800/40; A61K2800/42; A61K2800/43; A61K2800/60; A61K2800/61; A61K2800/62; A61K2800/621; C01; C01P; C01P2004/00; C01P2004/20; C01P2006/00; C01P2006/60; C01P2006/62; C01P2006/63; C01P2006/64; C09C2200/00; C09C2200/10; C09C2200/1087; C09C2200/30; C09C2200/301; C09C2220/00; C09C2220/10; C09C2220/103
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
46 words
An oxidized graphite flaky particle obtained by a process comprising: (a) oxidizing graphite flaky particles in an oxygen-containing atmosphere at 200°-500° C., (b) suspending graphite flaky particles in water and oxidizing said particles with a water-soluble oxidizing agent, or (c) a combination of (a) and (b).
Claim 2
Dependent Claim
46 words
An oxidized graphite flaky particle obtained by a process comprising: (a) oxidizing graphite flaky particles in an oxygen-containing atmosphere at 200°-500° C., (b) suspending graphite flaky particles in water and oxidizing said particles with a water-soluble oxidizing agent, or (c) a combination of (a) and (b).
Claim 3
Dependent Claim
37 words
A graphite flaky particle according to claim 1, prepared by a process comprising oxidizing graphite flaky particles in an oxygen-containing atmosphere, suspending said oxidized particles in water and additionally oxidizing said particles with a water-soluble oxidizing agent.
Claim 4
Dependent Claim
27 words
A flaky pigment comprising an oxidized graphite flaky particle according to claim 1, the surface of which is coated with a metal oxide hydrate and/or metal oxide.
Claim 5
Dependent Claim
22 words
A flaky pigment according to claim 3, wherein the metal oxide hydrate and/or metal oxide is titanium oxide hydrate or titanium dioxide.
Claim 6
Dependent Claim
28 words
A flaky pigment comprising an oxidized graphite flaky particle according to claim 4, the surface of which is coated with rutile titanium dioxide hydrate and/or rutile titanium dioxide.
Claim 7
Dependent Claim
28 words
A flaky pigment which comprises an oxidized graphite flaky particle according to claim 1, coated with rutile titanium dioxide hydrate and/or rutile titanium dioxide together with silicon dioxide.
Claim 8
Dependent Claim
54 words
A process for the production of a flaky pigment comprising suspending oxidized graphite flaky particles in water and adding to the suspension an aqueous solution of a metal salt and an aqueous solution of a basic substance simultaneously, thereby depositing metal oxide hydrate uniformly and densely on the surface of the graphite flake particles.
Claim 9
Dependent Claim
54 words
A process for the production of a flaky pigment comprising suspending oxidized graphite flaky particles in water and adding to the suspension an aqueous solution of a metal salt and an aqueous solution of a basic substance simultaneously, thereby depositing metal oxide hydrate uniformly and densely on the surface of the graphite flake particles.
Claim 10
Dependent Claim
76 words
A process for the production of a flaky pigment, comprising (a) oxidizing graphite flaky particles in an oxygen-containing atmosphere, (b) suspending graphite flaky particles in water and oxidizing said particles with a water-soluble oxidizing agent, or (c) a combination of (a) and (b), (d) suspending said particles in water and adding to the suspension an aqueous solution of a metal salt and a basic substance, thereby depositing metal oxide hydrate on the surface of the particles.
Claim 11
Dependent Claim
76 words
A process for the production of a flaky pigment, comprising (a) oxidizing graphite flaky particles in an oxygen-containing atmosphere, (b) suspending graphite flaky particles in water and oxidizing said particles with a water-soluble oxidizing agent, or (c) a combination of (a) and (b), (d) suspending said particles in water and adding to the suspension an aqueous solution of a metal salt and a basic substance, thereby depositing metal oxide hydrate on the surface of the particles.
Claim 12
Dependent Claim
64 words
A process according to claim 8, comprising oxidizing graphite flake particles in an oxygen-containing atmosphere, suspending said oxidized particles in water and additionally oxidizing said particles with a water-soluble oxidizing agent, and suspending said particles in water and adding to the suspension an aqueous solution of a metal salt and a basic substance, thereby depositing metal oxide hydrate on the surface of the particles.
Claim 13
Dependent Claim
13 words
A process according to claim 7 which further comprises calcining the flaky pigment.
Claim 14
Dependent Claim
13 words
A process according to claim 8 which further comprises calcining the flaky pigment.
Claim 15
Dependent Claim
13 words
A process according to claim 9 which further comprises calcining the flaky pigment.
Claim 16
Dependent Claim
118 words
A process for producing a flaky pigment according to claim 5 which comprises suspending oxidized graphite flaky particles in water, adding to the suspension an aqueous solution of a titanium salt and a metal salt selected from the group consisting of tin salts, zinc salts, lithium salts and antimony salts, and an aqueous solution of a basic substance, thereby depositing a mixture of titanium dioxide hydrate and metal oxide hydrate resulting from said metal salt on the surface of the graphite flaky particles, adding an aqueous solution of a titanium salt and an aqueous solution of a basic substance, thereby depositing titanium dioxide hydrate, and filtering the resulting solid substance, and washing, drying, and firing the solid substance.
Claim 17
Dependent Claim
108 words
A process for producing a flaky pigment according to claim 5 which comprises suspending oxidized graphite flaky particles in water, adding to the suspension an aqueous solution of a metal salt selected from the group consisting of tin salts, zinc salts, lithium salts and antimony salts, and an aqueous solution of a basic substance, thereby depositing a metal oxide hydrate resulting from said metal salt on the surface of the graphite flaky particles, adding an aqueous solution of a titanium salt and an aqueous solution of a basic substance, thereby depositing titanium dioxide hydrate, and filtering the resulting solid substance, and washing, drying, and firing the solid substance.
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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) | 1996-07-19 | 1997-01-18 | 1997-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-19 | 2001-01-18 | 2001-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-19 | 2005-01-18 | 2005-07-20 | $7700.00 | Window Closed / Lapsed |