US4518397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Articles containing non-fused aluminum oxide-based abrasive mineral
Assignee: 3M Co
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Filing: 1983-05-17
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Granted: 1985-05-21
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Expires: 2003-05-17
Abstract
Abstract The invention relates to synthetic, non-fused, aluminum oxide-based abrasive mineral having a microcrystalline structure of randomly oriented crystallites comprising a dominant continuous phase of α-alumina and a secondary phase, to a method of making the same employing chemical ceramic technology, and to abrasive articles made with the abrasive mineral.
Inventors
- 👤 Melvin A. Leitheiser
- 👤 Harold G. Sowman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:08
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C09; C09K; C09K3/00; C09K3/14; C09K3/1409; C09K3/1418
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
145 words
An abrasive article containing granular abrasive mineral comprising substantially calcium ion- and alkali metal ion-free, dense, non-fused synthetic, aluminum oxide-based granular abrasive mineral, comprising a secondary phase of randomly oriented crystallites comprising modifying component in a dominant continuous alumina phase comprising alpha-alumina, said modifying component, on a volume percent of fired solids of the mineral, being selected from: (i) at least 10% of zirconia, hafnia, a combination of zirconia and hafnia, a combination of zirconia and samaria, or a combination of zirconia, hafnia and samaria; (ii) at least 1% of a spinel derived from alumina and at least one oxide of a metal selected from cobalt, nickel, zinc, or magnesium, or a combination of said spinel with at least one of titania, ceria, or zirconia; (iii) 1-45% of said zirconia, hafnia, or the combination of zirconia and hafnia and at least 1% of said spinel.
Claim 2
Dependent Claim
145 words
An abrasive article containing granular abrasive mineral comprising substantially calcium ion- and alkali metal ion-free, dense, non-fused synthetic, aluminum oxide-based granular abrasive mineral, comprising a secondary phase of randomly oriented crystallites comprising modifying component in a dominant continuous alumina phase comprising alpha-alumina, said modifying component, on a volume percent of fired solids of the mineral, being selected from: (i) at least 10% of zirconia, hafnia, a combination of zirconia and hafnia, a combination of zirconia and samaria, or a combination of zirconia, hafnia and samaria; (ii) at least 1% of a spinel derived from alumina and at least one oxide of a metal selected from cobalt, nickel, zinc, or magnesium, or a combination of said spinel with at least one of titania, ceria, or zirconia; (iii) 1-45% of said zirconia, hafnia, or the combination of zirconia and hafnia and at least 1% of said spinel.
Claim 3
Dependent Claim
24 words
The abrasive article of claim 1 wherein said granular abrasive mineral is adhered to a flexible backing sheet to form a coated abrasive product.
Claim 4
Dependent Claim
20 words
The abrasive article of claim 1 wherein said granular abrasive mineral is adhered together to form a rotatable grinding wheel.
Claim 5
Dependent Claim
21 words
The abrasive article of claim 1 wherein said granular abrasive is adhered to and within a lofty nonwoven fibrous support web.
Claim 6
Dependent Claim
22 words
The abrasive article of claim 1 wherein said secondary phase of said granular abrasive mineral comprises spinel formed of magnesia and alumina.
Claim 7
Dependent Claim
26 words
The abrasive article of claim 1, 2, 3, or 4 wherein said granular abrasive mineral consists essentially of said dense, non-fused synthetic, aluminum oxide-based abrasive mineral.
Claim 8
Dependent Claim
17 words
The abrasive article of claim 1 or 4 including fused alumina as an additional granular abrasive mineral.
Claim 9
Dependent Claim
19 words
The abrasive article of claim 1 wherein said secondary phase of said granular abrasive mineral comprises zirconia and samaria.
Claim 10
Dependent Claim
38 words
The abrasive article of claim 1 wherein said secondary phase of said granular abrasive mineral comprises spinel formed by alumina and magnesia and another metal oxide selected from the group consisting of titania, ceria, zirconia and combinations thereof.
Claim 11
Dependent Claim
147 words
An abrasive article containing granular abrasive mineral comprising substantially alkali metal ion free, dense, non-fused synthetic, aluminum oxide-based granular abrasive mineral, comprising a secondary phase of randomly oriented crystallites comprising modifying component in a dominant continuous alumina phase comprising alpha-alumina, said modifying component, on a volume percent of fired solids of the mineral, being selected from the group consisting of: (i) at least 10% of zirconia, hafnia, a combination of zirconia and hafnia, a combination of zirconia and samaria, or a combination of zirconia, hafnia and samaria. (ii) at least 1% of a spinel derived from alumina and at least one oxide of a metal selected from cobalt, nickel, zinc, or magnesium, or a combination of said spinel with at least one of titania, ceria, or zirconia; (iii) 1-45% of said zirconia, hafnia, or the combination of zirconia and hafnia and at least 1% of said spinel.
Claim 12
Dependent Claim
147 words
An abrasive article containing granular abrasive mineral comprising substantially alkali metal ion free, dense, non-fused synthetic, aluminum oxide-based granular abrasive mineral, comprising a secondary phase of randomly oriented crystallites comprising modifying component in a dominant continuous alumina phase comprising alpha-alumina, said modifying component, on a volume percent of fired solids of the mineral, being selected from the group consisting of: (i) at least 10% of zirconia, hafnia, a combination of zirconia and hafnia, a combination of zirconia and samaria, or a combination of zirconia, hafnia and samaria. (ii) at least 1% of a spinel derived from alumina and at least one oxide of a metal selected from cobalt, nickel, zinc, or magnesium, or a combination of said spinel with at least one of titania, ceria, or zirconia; (iii) 1-45% of said zirconia, hafnia, or the combination of zirconia and hafnia and at least 1% of said spinel.
Claim 13
Dependent Claim
24 words
The abrasive article of claim 10 wherein said granular abrasive mineral is adhered to a flexible backing sheet to form a coated abrasive product.
Claim 14
Dependent Claim
20 words
The abrasive article of claim 10 wherein said granular abrasive mineral is adhered together to form a rotatable grinding wheel.
Claim 15
Dependent Claim
21 words
The abrasive article of claim 10 wherein said granular abrasive is adhered to and within a lofty nonwoven fibrous support web.
Claim 16
Dependent Claim
22 words
The abrasive article of claim 10 wherein said secondary phase of said granular abrasive mineral comprises spinel formed of magnesia and alumina.
Claim 17
Dependent Claim
26 words
The abrasive article of claim 10, 11, 12, or 13 wherein said granular abrasive material consists essentially of said dense, non-fused synthetic, aluminum oxide-based abrasive mineral.
Claim 18
Dependent Claim
17 words
The abrasive article of claim 10 or 13 including fused alumina as an additional granular abrasive mineral.
Claim 19
Dependent Claim
19 words
The abrasive article of claim 10 wherein said secondary phase of said granular abrasive mineral comprises zirconia and samaria.
Claim 20
Dependent Claim
38 words
The abrasive article of claim 10 wherein said secondary phase of said granular abrasive mineral comprises spinel formed by alumina and magnesia and another metal oxide selected from the grouop consisting of titania, ceria, zirconia and combinations thereof.
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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) | 1988-05-20 | 1988-11-19 | 1989-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-20 | 1992-11-19 | 1993-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-20 | 1996-11-19 | 1997-05-21 | $7700.00 | Window Closed / Lapsed |