US2628896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicon nitride abrasives
Assignee: Union Carbide Corp
•
Filing: 1949-02-23
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Granted: 1953-02-17
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Expires: 1969-02-23
Abstract
No abstract record available.
Inventors
- 👤 Hendrik De W Erasmus
- 👤 William D Forgeng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:13
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09K3/1409
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
AN ABRASIVE PRODUCT COMPRISING A SOLID BASE HAVING A SURFACE COATING OF ADHESIVE MATERIAL THEREON, AND A PLURALITY OF FINELY-DIVIDED PARTICLES OF SILICON NITRIDE EMBEDDED IN SAID COATING AND BONDED THEREBY TO SAID BASE.
Claim 2
Dependent Claim
34 words
AN ABRASIVE PRODUCT COMPRISING A SOLID BASE HAVING A SURFACE COATING OF ADHESIVE MATERIAL THEREON, AND A PLURALITY OF FINELY-DIVIDED PARTICLES OF SILICON NITRIDE EMBEDDED IN SAID COATING AND BONDED THEREBY TO SAID BASE.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-02-17 | 1956-08-18 | 1957-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-17 | 1960-08-18 | 1961-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-17 | 1964-08-18 | 1965-02-17 | $7700.00 | Window Closed / Lapsed |