US3259509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory materials and method of making same
Assignee: Allis Chalmers Corp
•
Filing: 1962-01-26
•
Granted: 1966-07-05
•
Expires: 1982-01-26
Abstract
No abstract record available.
Inventors
- 👤 Vlado I Matkovich
- 👤 Colton Ervin
- 👤 James L Peret
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 21:29
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/581
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
17 words
AN ALUMINUM NITRIDE-SILICON CARBIDE SOLID SOLUTION HAVING THE FORMULA XAIN:SIC WHERE X IS FROM 1 TO 20.
References Cited (Backward Citations)
US2406275A
Cited
US3108887A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-07-04 | 1970-01-03 | 1970-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-04 | 1974-01-03 | 1974-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-04 | 1978-01-03 | 1978-07-05 | $7700.00 | Window Closed / Lapsed |