Patent US4855264A successfully refreshed from Google Patents.
US4855264A
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Aluminum oxide/aluminum oxynitride/group IVB metal nitride abrasive particles derived from a sol-gel process
Assignee: 3M Co
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Filing: 1988-04-15
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Granted: 1989-08-08
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Expires: 2008-04-15
Abstract
Abstract The present invention provides a nearly fully dense, microcrystalline, composite ceramic abrasive particle comprising grains of alumina, gamma-aluminum oxynitride and, optionally, a Periodic Group IVB metal nitride in the system Al 2 O 3 /ALON/Group IVB metal nitride. In another aspect, two different processes for making an abrasive particle such as an abrasive grit, comprising a multiphase mixture of microcrystalline components in this system using sol gel techniques and pressureless reaction-sintering, are disclosed.
Inventors
- 👤 James P. Mathers
- 👤 William P. Wood
- 👤 Thomas Forester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:07
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/581; C04B35/01; C04B35/10; C04B35/111; C04B35/1115; C09; C09K; C09K3/00; C09K3/14; C09K3/1409; C09K3/1418
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
44 words
A coated ceramic abrasive product for grinding steel comprising a backing and having coated on at least one surface thereof a composition comprising a bonding resin and ceramic abrasive particles consisting essentially of a uniform multiphase composite consisting essentially of alumina and gamma-aluminum oxynitride.
Claim 2
Dependent Claim
44 words
A coated ceramic abrasive product for grinding steel comprising a backing and having coated on at least one surface thereof a composition comprising a bonding resin and ceramic abrasive particles consisting essentially of a uniform multiphase composite consisting essentially of alumina and gamma-aluminum oxynitride.
Claim 3
Dependent Claim
29 words
The coated ceramic abrasive product according to claim 1 wherein said particles consist essentially of 15 to 85 volume percent gamma-aluminum oxynitride and 85 to 15 volume percent alumina.
Claim 4
Dependent Claim
27 words
The coated ceramic abrasive product according to claim 1 wherein said ceramic abrasive particles consist essentially of 50 volume percent alumina and 50 volume percent gamma-aluminum oxynitride.
Claim 5
Dependent Claim
46 words
A coated ceramic abrasive product for grinding steel comprising a backing and having coated on at least one surface thereof a composition comprising a bonding resin and ceramic abrasive particles consisting essentially of a uniform multiphase composite consisting essentially of alumina, aluminum oxynitride, and titanium nitride.
Claim 6
Dependent Claim
46 words
A coated ceramic abrasive product for grinding steel comprising a backing and having coated on at least one surface thereof a composition comprising a bonding resin and ceramic abrasive particles consisting essentially of a uniform multiphase composite consisting essentially of alumina, aluminum oxynitride, and titanium nitride.
Claim 7
Dependent Claim
34 words
A coated abrasive product according to claim 4 wherein said particles consist essentially of 1 to 85 volume percent alumina, 15 to 85 volume percent gamma-aluminum oxynitride, and 15 to 35 volume percent TiN.
Claim 8
Dependent Claim
31 words
The coated ceramic abrasive product according to claim 4 wherein said ceramic abrasive particles consist essentially of 37.5 volume percent alumina, 37.5 percent aluminum oxynitride, and 25 volume percent titanium nitride.
Claim 9
Independent Claim
81 words
A method of grinding a steel comprising the step of: moving, in contact with each other, a steel surface and a ceramic abrasive article for a time sufficient to alter the grindable surface, said ceramic abrasive article comprising a uniform multiphase mixture of microcrystalline components, said components consists essentially of: 1 to 95 volume percent aluminum oxide, 1 to 95 volume percent gamma-aluminum oxynitride, and 0 to 50 volume percent of at least one of a Periodic Group IVB metal nitrides.
Claim 10
Independent Claim
81 words
A method of grinding a steel comprising the step of: moving, in contact with each other, a steel surface and a ceramic abrasive article for a time sufficient to alter the grindable surface, said ceramic abrasive article comprising a uniform multiphase mixture of microcrystalline components, said components consists essentially of: 1 to 95 volume percent aluminum oxide, 1 to 95 volume percent gamma-aluminum oxynitride, and 0 to 50 volume percent of at least one of a Periodic Group IVB metal nitrides.
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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) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |