US2986455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bonded abrasive articles
Assignee: Unifrax I LLC
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Filing: 1958-02-21
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Granted: 1961-05-30
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Expires: 1978-02-21
Abstract
No abstract record available.
Inventors
- 👤 Karl H Sandmeyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:18
CPC Classifications
B; B24; B24D; B24D7/00; B24D18/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
48 words
A BONDED ABRASIVE ARTICLE COMPRISING A PLURALITY OF HOLLOW, GENERALLY SPHERICAL, THIN-WALLED BUBBLES OF FUSED ABRASIVE MATERIAL SELECTED FROM THE GROUP CONSISTING OF FUSED ALUMINA AND FUSED ZIROCONA, EACH SAID BUBBLE HAVING A SINGLE, CENTRAL ACTIVITY, AND AN INDUSTRIAL MATRIX BONDING SAID PARTICLES TOGETHER AND SELECTED FROM THE
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) | 1964-05-29 | 1964-11-28 | 1965-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-29 | 1968-11-28 | 1969-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-29 | 1972-11-28 | 1973-05-30 | $7700.00 | Window Closed / Lapsed |