US5215552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sol-gel alumina abrasive grain
Assignee: Saint Gobain Abrasives Inc
•
Filing: 1992-02-26
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Granted: 1993-06-01
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Expires: 2012-02-26
Abstract
Abstract A sol-gel alumina abrasive grain with valuable grinding characteristics is obtained by inducing microcracking in the grain surfaces.
Inventors
- 👤 Jason Sung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:06
CPC Classifications
B; B24; B24D; B24D11/00; B24D3/00; B24D3/02; B24D3/04; B24D3/14; C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/1115; C04B35/622; C04B35/624; C09; C09K; C09K3/00; C09K3/14; C09K3/1409; C09K3/1427
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
22 words
A sol-gel alumina abrasive grain having from about 10 to about 200 microcracks per square millimeter of the surface of the grain.
Claim 2
Dependent Claim
22 words
A sol-gel alumina abrasive grain having from about 10 to about 200 microcracks per square millimeter of the surface of the grain.
Claim 3
Dependent Claim
29 words
An abrasive grain according to claim 1 having from about 50 to about 150 microcracks per square millimeter of the grain surface in the form of an interconnected network.
Claim 4
Dependent Claim
15 words
An abrasive grain according to claim 1 which is formed from a seeded sol-gel alumina.
Claim 5
Dependent Claim
14 words
An abrasive grain according to claim 1 in the form of a filamentary particle.
Claim 6
Dependent Claim
16 words
An abrasive grain according to claim 1 having a grain size of 50 grit or finer.
Claim 7
Dependent Claim
29 words
A seeded sol-gel alumina filamentary abrasive grain having from about 10 to about 200 microcracks per square millimeter of the grain surface in the form of an interconnected network.
Claim 8
Dependent Claim
29 words
A seeded sol-gel alumina filamentary abrasive grain having from about 10 to about 200 microcracks per square millimeter of the grain surface in the form of an interconnected network.
Claim 9
Dependent Claim
54 words
A process for the production of a sol-gel alumina abrasive grain having from about 10 to about 200 microcracks per square millimeter of the grain surface which comprises heating the grain to an elevated temperature and then quenching the grain to a temperature that is from about 200° C. to about 1000° C. lower.
Claim 10
Dependent Claim
54 words
A process for the production of a sol-gel alumina abrasive grain having from about 10 to about 200 microcracks per square millimeter of the grain surface which comprises heating the grain to an elevated temperature and then quenching the grain to a temperature that is from about 200° C. to about 1000° C. lower.
Claim 11
Dependent Claim
17 words
A process according to claim 7 in which the grain is quenched by immersing it in water.
Claim 12
Dependent Claim
25 words
A process according to claim 7 in which the quenching reduces the temperature of the grain by from about 200° C. to about 500° C.
Claim 13
Dependent Claim
15 words
A process according to claim 7 in which the grain comprises a seeded sol-gel alumina.
Claim 14
Dependent Claim
18 words
A process according to claim 7 in which the grain is a seeded sol-gel alumina filamentary abrasive grain.
Claim 15
Dependent Claim
62 words
A process for the production of a seeded sol-gel alumina filamentary abrasive grain having from at least 50 to about 150 microcracks per square millimeter of the grain surface in the form of an interconnected network, which comprises quenching the grain from a temperature of from about 250° C. to about 750° C. by dumping it into water at about room temperature.
Claim 16
Dependent Claim
62 words
A process for the production of a seeded sol-gel alumina filamentary abrasive grain having from at least 50 to about 150 microcracks per square millimeter of the grain surface in the form of an interconnected network, which comprises quenching the grain from a temperature of from about 250° C. to about 750° C. by dumping it into water at about room temperature.
Claim 17
Dependent Claim
10 words
An abrasive article comprising a grain according to claim 1.
Claim 18
Dependent Claim
10 words
An abrasive article comprising a grain according to claim 6.
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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) | 1996-05-31 | 1996-11-30 | 1997-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-31 | 2000-11-30 | 2001-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-31 | 2004-11-30 | 2005-06-01 | $7700.00 | Window Closed / Lapsed |