US3574579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bronze-iron metal-bonded diamond abrasive articles containing boron nitride particles
Assignee: Unifrax I LLC
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Filing: 1969-05-05
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Granted: 1971-04-13
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Expires: 1989-05-05
Abstract
Abstract METAL-BONDED DIAMOND GRINDING WHEELS ARE IMPROVED BY THE INCLUSION OF FROM ABOUT 15% TO ABOUT 60% BY VOLUME OF GRANULAR BORON NITRIDE, HAVING A PARTICLE SIZE RANGING FROM ABOUT 63 TO ABOUT 1000 MICRONS, IN THE ABRASIVE SECTION OF THE WHEEL. THE INCLUSION OF THE BORON NITRIDE REDUCES THE TEMPERATURE GENERATED WHEN THE WHEEL IS USED WITHOUT LIQUID COOLANT, AND IMPROVES THE GRINDING RATIO (WEIGHT OF MATERIAL REMOVED PER WEIGHT OF WHEEL WORN). THE INVENTION MAKES POSSIBLE THE GENERAL USE OF METAL-BONDED DIAMOND ABRASIVE WHEELS UNDER DRY GRINDING CONDITIONS, I.E., WITHOUT LIQUID COOLANT.
Inventors
- 👤 Howard S Clarke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:22
CPC Classifications
B; B24; B24D; B24D3/00; B24D3/34; B24D3/342
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |