US5026404A
Expired / Lapsed
US
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Abrasives
Assignee: Imerys Fused Minerals Laufenburg GmbH
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Filing: 1989-12-07
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Granted: 1991-06-25
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Expires: 2009-12-07
Abstract
Abstract An abrasive grain with an aluminum oxide base which is distinguished by good throwing power and by a good capability of being integrated in flexible abrasives or in grinding wheels with artificial resin bonding.
Inventors
- 👤 Reiner Kunz
- 👤 Albert Babl
- 👤 Ales Zahradnicek
- 👤 Rainer Dietrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:19
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
99 words
Abrasive grain having an aluminum oxide base, comprising the aluminum oxide base with a hydrophilic substance coated on its surface, the amount of said hydrophilic substance being 0.001 to 5.0 percent by weight relative to the amount of the abrasive grain, measured in grain beds, being smaller than 3.5 ×10 10 ohms × cm, the hydrophilic substance being a metal oxide in the form of superfine particles with a particle size of the primary particles in the d 50 value of 1 to 500 nm and a specific surface according to BET of 5 to 500 m 2 /g.
Claim 2
Dependent Claim
99 words
Abrasive grain having an aluminum oxide base, comprising the aluminum oxide base with a hydrophilic substance coated on its surface, the amount of said hydrophilic substance being 0.001 to 5.0 percent by weight relative to the amount of the abrasive grain, measured in grain beds, being smaller than 3.5 ×10 10 ohms × cm, the hydrophilic substance being a metal oxide in the form of superfine particles with a particle size of the primary particles in the d 50 value of 1 to 500 nm and a specific surface according to BET of 5 to 500 m 2 /g.
Claim 3
Dependent Claim
65 words
Abrasive grain having an aluminum oxide base, comprising the base with a hydrophilic superfine metal oxide coated on its surface, the amount of said hydrophilic superfine metal oxide being 0.001 to 0.5 percent by weight relative to the amount of the abrasive grain, the specific resistance of the treated abrasive grain, measured in grain beds, being smaller than 3.5 × 10 10 ohms × cm.
Claim 4
Dependent Claim
65 words
Abrasive grain having an aluminum oxide base, comprising the base with a hydrophilic superfine metal oxide coated on its surface, the amount of said hydrophilic superfine metal oxide being 0.001 to 0.5 percent by weight relative to the amount of the abrasive grain, the specific resistance of the treated abrasive grain, measured in grain beds, being smaller than 3.5 × 10 10 ohms × cm.
Claim 5
Dependent Claim
25 words
The abrasive grain according to claim 1 wherein the amount of substance is 0.1 to 0.5 percent by weight relative to the amount of abrasive.
Claim 6
Dependent Claim
34 words
The abrasive grain according to claim 2 wherein the specific resistance of the treated abrasive grain, measured in grain beds, is between 0.05 × 10 10 and 2.5 × 10 10 ohms × cm.
Claim 7
Dependent Claim
52 words
The abrasive grain according to claim 1 wherein a metal oxide with superfine particles with a particle size of the primary particles in the d 50 value of 10 to 50 nm and a specific surface according to BET of 50 to 380 m 2 /g is used as the hydrophilic substance.
Claim 8
Dependent Claim
28 words
The abrasive grain according to claim 1 wherein a silicon dioxide, aluminum oxide or titanium dioxide in the form of superfine particles is used as the hydrophilic substance.
Claim 9
Dependent Claim
28 words
The abrasive grain according to claim 1 wherein a silicon dioxide, aluminum oxide or titanium dioxide in the form of superfine particles is used as the hydrophilic substance.
Claim 10
Dependent Claim
50 words
Abrasive produced by coating a base, which exhibits an adhesion promoter, with said abrasive grain according to claim which has been coated with said hydrophilic superfine metal oxide in the electrical field of 20,000 to 100,000 v, at a relative humidity of 30 to 90 percent in the processing range.
Claim 11
Dependent Claim
46 words
Abrasive grain having an aluminum oxide base, the surface of the abrasive grain having been treated with a hydrophilic superfine metal oxide, and the amount of the hydrophilic superfine metal oxide being 0.001 to 5.0 percent by weight relative to the amount of the abrasive grain.
Claim 12
Dependent Claim
46 words
Abrasive grain having an aluminum oxide base, the surface of the abrasive grain having been treated with a hydrophilic superfine metal oxide, and the amount of the hydrophilic superfine metal oxide being 0.001 to 5.0 percent by weight relative to the amount of the abrasive grain.
References Cited (Backward Citations)
US3528790A
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US4110083A
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US4111668A
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US4157898A
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US4162899A
Cited
US4203733A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-06-24 | 1994-12-24 | 1995-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-24 | 1998-12-24 | 1999-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-24 | 2002-12-24 | 2003-06-25 | $7700.00 | Window Closed / Lapsed |