US3881282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasive grain of fused alumina-zirconia-ceria alloy
Assignee: Saint Gobain Abrasives Inc
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Filing: 1973-10-24
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Granted: 1975-05-06
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Expires: 1993-10-24
Abstract
Abstract Improved fused zirconia alumina is decribed. The abrasive is superior to normal alumina-zirconia abrasive in two ways. 1. Where processed into grain, the grain yield is much higher, which gives a lower comminution cost per pound of useable grain. 2. The grain durability is much higher, while maintaining or improving the rate of metal removal, in snagging tests. These improvements are realized by making an addition of from 1 to 7% of ceria to an alumina-zirconium fusion.
Inventors
- 👤 George R Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:23
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09K3/1409; C09K3/1427
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
43 words
AN IMPROVED FUSED CRUSHED ABRASIVE GRAIN CONSISTING ESSENTIALLY OF A CO-FUSION OF ALUMINA, ZIRCONIA AND CERIA; SAID ZIRCONIA BEING PRESENT IN A RANGE OF FROM 10 TO 60% BY WEIGHT; THE CERIA BEING PRESENT IN A RANGE OF FROM 1 TO ABOUT 7%.
Claim 2
Dependent Claim
43 words
AN IMPROVED FUSED CRUSHED ABRASIVE GRAIN CONSISTING ESSENTIALLY OF A CO-FUSION OF ALUMINA, ZIRCONIA AND CERIA; SAID ZIRCONIA BEING PRESENT IN A RANGE OF FROM 10 TO 60% BY WEIGHT; THE CERIA BEING PRESENT IN A RANGE OF FROM 1 TO ABOUT 7%.
Claim 3
Dependent Claim
19 words
A grain as in claim 1 wherein the zirconia is present in the amount of from 21 to 26%.
Claim 4
Dependent Claim
18 words
A grain as in claim 1 that has been calcined at 800* to 1250*C to improve its toughness.
Claim 5
Dependent Claim
18 words
A grain as in claim 2 that has been calcined at 800* to 1250*C to improve its toughness.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |