US5009675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated silicon carbide abrasive grain
Assignee: Lonza AG
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Filing: 1989-06-08
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Granted: 1991-04-23
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Expires: 2009-06-08
Abstract
Abstract An abrasive grain on the basis of silicon carbide with a binder-free coating of highly dispersed silicon, aluminum or titanium oxide for preferred use in resin-bonded or ceramic-bonded abrasive wheels.
Inventors
- 👤 Reiner Kunz
- 👤 Rainer Dietrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:46
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/628; C04B35/62802; C04B35/62805; C04B35/62807; B; B82; B82Y; B82Y30/00; C04B35/62813; C04B35/62818; C04B35/62821; C04B35/62892; C04B41/00; C04B41/009; C04B41/45; C04B41/4584; C04B41/80; C04B41/81; C09; C09K; C09K3/00; C09K3/14; C09K3/1436; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/38; C04B2235/3817; C04B2235/3826; C04B2235/50; C04B2235/54; C04B2235/5409; C04B2235/5418; C04B2235/5427; C04B2235/5454; C04B2235/549
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
83 words
Abrasive grain comprising at least one silicon carbide particle and a binder-free unmelted coating of 0.01 to 5 percent, relative to the weight of the abrasive grain, of highly dispersed hydrophilic metal oxide particles having a particle size of primary particles of about 1-500 nm in the d 50 value and a specific surface of 5-500 m 2 /g according to BET from the group of silicon dioxide, aluminum oxide, titanium dioxide and mixtures thereof, on the at least one silicon carbide particle.
Claim 2
Dependent Claim
83 words
Abrasive grain comprising at least one silicon carbide particle and a binder-free unmelted coating of 0.01 to 5 percent, relative to the weight of the abrasive grain, of highly dispersed hydrophilic metal oxide particles having a particle size of primary particles of about 1-500 nm in the d 50 value and a specific surface of 5-500 m 2 /g according to BET from the group of silicon dioxide, aluminum oxide, titanium dioxide and mixtures thereof, on the at least one silicon carbide particle.
Claim 3
Dependent Claim
15 words
The abrasive grain according to claim 1 wherein the hydrophilic metal oxide is aluminum oxide.
Claim 4
Dependent Claim
27 words
The abrasive grain according to claim 1 wherein the hydrophilic metal oxide is a mixture of at least two of silicon dioxide, aluminum oxide and titanium dioxide.
Claim 5
Dependent Claim
32 words
The abrasive grain according to claim 1 wherein the highly dispersed hydrophilic metal oxide is applied in an amount of 0.1 to 1.0 percent, relative to the weight of the abrasive grain.
Claim 6
Dependent Claim
45 words
The abrasive grain according to claim 4 wherein the highly dispersed hydrophilic metal oxide has a particle size of primary particles of 1 to 500 nm in the d 50 value and a specific surface to 50 to 500 m 2 /g according to BET.
Claim 7
Dependent Claim
45 words
The abrasive grain according to claim 4 wherein the highly dispersed hydrophilic metal oxide has a particle size of primary particles of 1 to 50 nm in the d 50 value and a specific surface to 50 to 400 m 2 /g according to BET.
Claim 8
Dependent Claim
45 words
The abrasive grain according to claim 1 wherein the highly dispersed hydrophilic metal oxide has a particle size of primary particles of 5 to 50 nm in the d 50 value and a specific surface of 50 to 400 m 2 /g according to BET.
Claim 9
Dependent Claim
33 words
Process for the production of the abrasive grain according to claim 1 wherein the silicon carbide particles are coated by mixing in the dry condition with the highly dispersed hydrophilic metal oxide particles.
Claim 10
Dependent Claim
16 words
The process as claimed in claim 8 wherein the mixing is done in a tumbling mixer.
Claim 11
Dependent Claim
43 words
Process for the production of the abrasive grain according to claim 1 wherein the silicon carbide particles are coated by mixing with a suspension of the highly dispersed hydrophilic metal oxide in a vaporizable liquid and then drying the coated silicon carbide particles.
Claim 12
Dependent Claim
21 words
The process as claimed in claim 10 wherein the vaporizable liquid is a vaporizable polar liquid or a vaporizable nonpolar liquid.
Claim 13
Dependent Claim
13 words
The process as claimed in claim 10 wherein the vaporizable liquid is water.
Claim 14
Dependent Claim
13 words
A resin-bonded or ceramic-bonded abrasive wheel containing the abrasive grain of claim 1.
Claim 15
Dependent Claim
19 words
The abrasive wheel of claim 13 which also contains diamond abrasive grain, cubic boron nitride abrasive grain, or both.
Claim 16
Dependent Claim
15 words
The abrasive wheel of claim 13 wherein the abrasive wheel is a resin-bonded abrasive wheel.
Claim 17
Dependent Claim
15 words
The abrasive wheel of claim 13 wherein the abrasive wheel is a ceramic-bonded abrasive wheel.
References Cited (Backward Citations)
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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) | 1994-04-22 | 1994-10-22 | 1995-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-22 | 1998-10-22 | 1999-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-22 | 2002-10-22 | 2003-04-23 | $7700.00 | Window Closed / Lapsed |