Patent US4157898A successfully refreshed from Google Patents.
US4157898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fused aluminum oxide abrasive grain containing reduced titanium oxide
Assignee: Stemcor Corp
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Filing: 1978-04-14
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Granted: 1979-06-12
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Expires: 1998-04-14
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 Ti2O3; from about 0.05 to about 0.3% by weight carbon; from about 0.02 to about 0.1% by weight Na2O; 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 Na2O 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
2026-11-01 12:32
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09K3/1409; C09K3/1427; B; B24; B24D; B24D3/00; B24D3/02; B24D3/20; B24D3/28; B24D3/285
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
124 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 ; (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 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.
Claim 2
Dependent Claim
124 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 ; (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 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.
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
15 words
A bonded abrasive product according to claim 6, in the form of a grinding 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) | 1982-06-11 | 1982-12-11 | 1983-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-11 | 1986-12-11 | 1987-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-11 | 1990-12-11 | 1991-06-12 | $7700.00 | Window Closed / Lapsed |