US3916585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sintered abrasive containing oxides from the system ceria, alumina, zirconia
Assignee: Saint Gobain Abrasives Inc
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Filing: 1973-10-24
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Granted: 1975-11-04
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Expires: 1993-10-24
Abstract
Abstract Compositions in the ceria, alumina, zirconia ternary composition diagram are prepared by sintering very finely divided powder mixtures which are preformed into abrasive grit sized particles prior to firing at 1350* to 1600*C. Very strong grits are obtained, highly resistant to impact, and having a low destructability factor in the rough grinding of metals such as stainless steel and carbon steels.
Inventors
- 👤 Ronald E Barks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:39
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09K3/1409; C09K3/1418
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
83 words
A GRINDING WHEEL CONTAINING BONDED ABRASIVE GRITS WHICH GRITS ARE PRODUCED BY SINTERING OF FORMED TO SIZE PARTICLES, SAID GRINDING WHEEL BEING ADAPTED FOR ROUGH GRINDING APPLICATION SUCH AS SNAG GRINDING OF STAINLESS STEEL CHARACTERIZED IN THAT THE INDIVIDUAL ABRASIVE GRITS HAVE A COMPOSITION INCLUDING ALUMINA, CERIA, AND ZIRCONIA IN THE COMPOSITIONAL AMOUNTS REPRESENTED WITHIN THE AREA DEFINED BY TH BOUNDARY AEBC IN THE ACCOMPANYING TERNARY COMPOSITION DIAGRAM, THE ALUMINA, ZIRCONIA, AND CERIA AMOUNTING TO AT LEAST 95 WEIGHT % OF THE COMPOSITION.
Claim 2
Dependent Claim
83 words
A GRINDING WHEEL CONTAINING BONDED ABRASIVE GRITS WHICH GRITS ARE PRODUCED BY SINTERING OF FORMED TO SIZE PARTICLES, SAID GRINDING WHEEL BEING ADAPTED FOR ROUGH GRINDING APPLICATION SUCH AS SNAG GRINDING OF STAINLESS STEEL CHARACTERIZED IN THAT THE INDIVIDUAL ABRASIVE GRITS HAVE A COMPOSITION INCLUDING ALUMINA, CERIA, AND ZIRCONIA IN THE COMPOSITIONAL AMOUNTS REPRESENTED WITHIN THE AREA DEFINED BY TH BOUNDARY AEBC IN THE ACCOMPANYING TERNARY COMPOSITION DIAGRAM, THE ALUMINA, ZIRCONIA, AND CERIA AMOUNTING TO AT LEAST 95 WEIGHT % OF THE COMPOSITION.
Claim 3
Dependent Claim
32 words
A grinding wheel as in claim 1 containing abrasive grits in which the compositional amounts of zirconia, alumina, and ceria are included within the boundary DEBF in the accompanying ternary composition drawing.
Claim 4
Dependent Claim
40 words
A grinding wheel as in claim 1 in which the individual grits contain, in addition to alumina, zirconia and ceria, oxides of metals selected from the group consisting of silicon, titanium, iron, calcium, magnesium, manganese, vanadium, chromium, nickel, and cobalt.
Claim 5
Dependent Claim
21 words
A grinding wheel as in claim 1 containing abrasive grits in which the average crystal size is less than 5 microns.
Claim 6
Dependent Claim
29 words
A grinding wheel as in claim 1 containing abrasive grit having an impact strength, k at 209 feet per second of less than 0.2 in the 8 grit size.
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) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |