USRE31725E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fused aluminum oxide abrasive grain containing reduced titanium oxide
Assignee: Electro Minerals Canada Inc
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Filing: 1980-09-02
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Granted: 1984-11-06
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Expires: 2000-09-02
Abstract
Abstract A fused abrasive grain, useful for inclusion in coated abrasives and bonded abrasives, consists essentially of alumina; titanium oxide containing from about 0.42 to about 0.84% titaniun, by weight of the abrasive grain, present as a reduced titanium oxide having an average oxidation state lower than in Ti 2 O 3 ; from about 0.05 to about 0.3% by weight carbon; from about 0.02 to about 0.1% by weight Na 2 O; and from 0 to about 0.1% by weight total of calcium and silicon oxides. The grain before roasting has a gain on ignition of from about 0.4 to about 0.7% by weight, and is produced in an electric furnace by fusing high-purity titania, alumina containing Na 2 O as the only significant oxide impurity, and carbon, followed by crushing and roasting the fused grain.
Inventors
- 👤 Thomas B. Walker
- 👤 Robert J. Seider
- 👤 Paul Cichy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:45
CPC Classifications
B; B24; B24D; B24D3/00; B24D3/02; B24D3/04; B24D3/14; B24D3/20; B24D3/28; B24D3/285; C; C09; C09K; C09K3/00; C09K3/14; C09K3/1409; C09K3/1427
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
190 words
A fused abrasive grain which is bluish black in color consisting essentially of: (1) .[.titanium oxide containing.]. from about 0.42 to about 0.84% titanium, by weight of the abrasive grain, .[.said titanium being present as a reduced titanium oxide having an average oxidation state lower than in Ti 2 O 3 .]. .Iadd.wherein said titanium is present in an easily recognizable second phase and in a form which has a low solubility in aluminum oxide.Iaddend.; (2) from about 0.05 to about 0.3% by weight carbon; (3) from about 0.02 to about 0.1% by weight Na 2 O; (4) from 0 to about 0.1% by weight total of calcium and silicon oxides; and (5) alumina; said abrasive .Iadd.grain .Iaddend.having a gain on ignition in air before roasting at 1300° C., when of a size of about 147 microns and finer, of from about 0.4 to about 0.7% by weight .Iadd.and having improved abrasive properties wherein said fused abrasive grain has been roasted by subjecting the grain to an oxidizing atmosphere at a temperature of from about 1250° C. to about 1450° C. for from about 5 minutes to about 64 hours.Iaddend..
Claim 2
Dependent Claim
190 words
A fused abrasive grain which is bluish black in color consisting essentially of: (1) .[.titanium oxide containing.]. from about 0.42 to about 0.84% titanium, by weight of the abrasive grain, .[.said titanium being present as a reduced titanium oxide having an average oxidation state lower than in Ti 2 O 3 .]. .Iadd.wherein said titanium is present in an easily recognizable second phase and in a form which has a low solubility in aluminum oxide.Iaddend.; (2) from about 0.05 to about 0.3% by weight carbon; (3) from about 0.02 to about 0.1% by weight Na 2 O; (4) from 0 to about 0.1% by weight total of calcium and silicon oxides; and (5) alumina; said abrasive .Iadd.grain .Iaddend.having a gain on ignition in air before roasting at 1300° C., when of a size of about 147 microns and finer, of from about 0.4 to about 0.7% by weight .Iadd.and having improved abrasive properties wherein said fused abrasive grain has been roasted by subjecting the grain to an oxidizing atmosphere at a temperature of from about 1250° C. to about 1450° C. for from about 5 minutes to about 64 hours.Iaddend..
Claim 3
Dependent Claim
56 words
A fused abrasive grain according to claim 1, consisting essentially of: (1) .[.titanium oxide containing.]. about 0.72% titanium, by weight of the abrasive grain; (2) about 0.2% by weight carbon; (3) about 0.05% by weight Na 2 O; and (4) about 98.5% by weight alumina; and having a gain on ignition of about 0.5% by weight.
Claim 4
Dependent Claim
26 words
A coated abrasive product comprising: (1) a flexible backing; (2) abrasive grain according to claim 1; and (3) adhesive bonding said abrasive grain to said backing.
Claim 5
Dependent Claim
39 words
A coated abrasive product according to claim 3, wherein the flexible backing is cloth; the adhesive comprises a making coat of phenolic resin comprising a calcium carbonate filler and a size coat of phenolic resin comprising a reactive filler.
Claim 6
Dependent Claim
23 words
A coated abrasive product according to claim 4, comprising a base layer of abrasive grain, under said abrasive grain comprising reduced titanium oxide.
Claim 7
Dependent Claim
22 words
A bonded abrasive product comprising: (1) abrasive grain according to claim 1; and (2) a bonding matrix, bonding together the abrasive grain.
Claim 8
Dependent Claim
15 words
A bonded abrasive product according to claim 6, wherein the bonding matrix is phenolic resin.
Claim 9
Dependent Claim
16 words
A bonded abrasive product according to claim 6, wherein the bonding matrix is vitrified ceramic bond.
Claim 10
Dependent Claim
16 words
A bonded abrasive product according to claim 6, in the form of a grinding wheel. .Iadd.
Claim 11
Dependent Claim
40 words
A fused abrasive grain according to claim 1, wherein the grain size is that produced by solidification of a molten mixture in a water cooled steel pan at a depth of from about 2.5 to about 15 cm. .Iaddend. .Iadd.
Claim 12
Dependent Claim
60 words
The abrasive grain of claim 1, wherein the grain size is that produced when a molten mixture of the composition set forth is poured into a water cooled steel pan to a depth of from about 2.5 to about 6 cm. .Iaddend. .Iadd.12. The abrasive grain of claim 1, wherein roasting is from about 5 to about 20 minutes. .Iaddend.
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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) | 1987-11-06 | 1988-05-07 | 1988-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-06 | 1992-05-07 | 1992-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-06 | 1996-05-07 | 1996-11-06 | $7700.00 | Window Closed / Lapsed |