US5350448A
Expired / Lapsed
US
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Electrically conductive pigments
Assignee: Merck Patent GmbH
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Filing: 1993-04-22
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Granted: 1994-09-27
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Expires: 2013-04-22
Abstract
Abstract A process for the preparation of light-colored, electrically conductive pigments based on substrates having an expansion of not more than 500 μm, which pigments consist of one or more metals, metal oxides or materials containing metal oxide, silicon oxide or silicate materials and contain, if desired above one or more other metal oxide and/or silicon oxide layers, an outer layer based on halogen-doped tin oxide and/or titanium oxide.
Inventors
- 👤 Johann Dietz
- 👤 Klaus Franz
- 👤 Gerhard Pfaff
- 👤 Reiner Vogt
- 👤 Katsuhisa Nitta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:23
CPC Classifications
C; C09; C09C; C09C3/00; C09C3/06; C09C3/063; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C09C1/00; C09C1/0015; C09C1/28; C09C1/30; C09C1/3045; C09C1/36; C09C1/3607; C09C1/3653; C09C1/40; C09C1/405; C09D; C09D11/00; C09D11/02; C09D11/03; C09D11/037; C09D5/00; C09D5/24; C09D7/00; C09D7/40; C09D7/60; C09D7/61; C09D7/62; C01; C01P; C01P2002/00; C01P2002/50; C01P2002/52; C01P2004/00; C01P2004/20; C01P2004/54; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/40; C08K3/01; C08K3/013; C08K9/00; C08K9/02; C09C2200/00; C09C2200/40; C09C2200/401; C09C2220/00; C09C2220/10; C09C2220/106
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
31 words
An light-colored, electrically conductive pigment comprising a substrate optionally coated with at least one metal oxide layer and thereon a conductive layer comprising halogen-doped tin oxide and/or halogen doped titanium oxide.
Claim 2
Dependent Claim
31 words
An light-colored, electrically conductive pigment comprising a substrate optionally coated with at least one metal oxide layer and thereon a conductive layer comprising halogen-doped tin oxide and/or halogen doped titanium oxide.
Claim 3
Dependent Claim
30 words
A pigment according to claim 1, wherein an hydrated silicon dioxide layer or a layer of an insoluble silicate is located between the substrate surface and the outer conductive layer.
Claim 4
Dependent Claim
11 words
A pigment according to claim 1, wherein the substrate is platelet-shaped.
Claim 5
Dependent Claim
17 words
A pigment according to claim 3, wherein the platelet-shaped substrate comprises a sheet silicate or glass platelets.
Claim 6
Dependent Claim
19 words
A pigment according to claim 3, wherein the platelet-shaped substrate comprises a transparent, inorganic matrix comprising an inorganic pigment.
Claim 7
Dependent Claim
12 words
A pigment according to claim 5, wherein the matrix is silicon dioxide.
Claim 8
Dependent Claim
13 words
A pigment according to claim 5, wherein the inorganic pigment is titanium dioxide.
Claim 9
Dependent Claim
14 words
A pigment according to claim 3, wherein the platelet-shaped substrate comprises silicon dioxide platelets.
Claim 10
Dependent Claim
22 words
In a pigmenting lacquer, printing ink, or plastic system comprising a pigment, the improvement wherein the pigment is one of claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-09-26 | 1998-03-28 | 1998-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-26 | 2002-03-28 | 2002-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-26 | 2006-03-28 | 2006-09-27 | $7700.00 | Window Closed / Lapsed |