US3224850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicon aluminum boride complex
Assignee: Electro Refractories and Abrasives Corp
•
Filing: 1962-04-05
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Granted: 1965-12-21
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Expires: 1982-04-05
Abstract
No abstract record available.
Inventors
- 👤 Norman P Robie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:17
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/5805; C01; C01B; C01B35/00; C01B35/02; C01B35/04; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; C09; C09K; C09K3/00; C09K3/14; C09K3/1409; C09K3/1427; C22; C22C; C22C26/00; C22C29/00; C22C29/14; Y; Y10; Y10T; Y10T24/00; Y10T24/14; Y10T24/1498
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
68 words
A GRINDING WHEEL COMPRISING, A MIXTURE OF ABRASIVE GRANULES OF DENSITY GREATER THAN 5.0 AND FUSED GRANULES OF A COMPOSITION CONSISTING ESSENTIALLY OF SILICON, ALUMINUM AND BORON IN SUCH RELATIVE PROPORTIONS THAT THEIR RATIOS FALL WITHIN AREA GHJK OF THE ACCOMPANYING DIAGRAM, SAID TYPES OF GRANULES BEING MIXED IN A RATIO BETWEEN 1:3 AND 3:1 BY VOLUME, AND HELD TOGETHER IN FIXED RELATION BY A PHENOLIC RESIN BINDER.
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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) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |