US3607162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of a zirconium oxide and aluminum oxide abrasive of high grit toughness
Assignee: Dynamit Nobel AG
•
Filing: 1967-11-28
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Granted: 1971-09-21
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Expires: 1987-11-28
Abstract
Abstract Substantially pore-free abrasive grit comprising zirconium oxide mixed with alumina or bauxite made by mixing the components together in molten form in the substantial absence of nitrogen.
Inventors
- 👤 Gerd Edzard Bockstiegel
- 👤 Peter Hack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:19
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09K3/1409; C09K3/1427
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
16 words
The improved process claimed in claim 1 wherein reducing carbon is introduced into said mixed melt.
Claim 2
Dependent Claim
26 words
The improved process claimed in claim 2 wherein said reducing carbon is at least one member selected from the group consisting of coke and anthracite coal.
Claim 3
Dependent Claim
22 words
The improved process claimed in claim 1 wherein the weight ratio of zirconium oxide to aluminum oxide is about 4 to 6.
References Cited (Backward Citations)
US1240491A
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US2383035A
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US2961296A
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US3181939A
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US3175894A
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US3428443A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |