US3051564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition for metallurgical use and process of using the same
Assignee: Unifrax I LLC
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Filing: 1959-08-12
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Granted: 1962-08-28
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Expires: 1979-08-12
Abstract
No abstract record available.
Inventors
- 👤 John F Drenning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:50
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/04; C21C1/00; C21C1/08; C22; C22B; C22B1/00; C22B1/14; C22B1/24; C22B1/242; C22B1/243
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
THE PROCESS OF MELTING IRON FOR CASTINGS COMPRISING BRINGING A MIXTURE COMPRISING A MAJOR PROPORTION OF SILICON CARBIDE AND IN EXCESS OF ABOUT 10 PARTS UP TO ABOUT 25 PARTS BY WEIGHT OF AN ALKALINE MODIFYING AGENT PER 100 PARTS BY WEIGHT OF PURE SILICON CARBIDE INTO CONTACT WITH THE MOLTEN IRON.
Claim 2
Dependent Claim
52 words
THE PROCESS OF MELTING IRON FOR CASTINGS COMPRISING BRINGING A MIXTURE COMPRISING A MAJOR PROPORTION OF SILICON CARBIDE AND IN EXCESS OF ABOUT 10 PARTS UP TO ABOUT 25 PARTS BY WEIGHT OF AN ALKALINE MODIFYING AGENT PER 100 PARTS BY WEIGHT OF PURE SILICON CARBIDE INTO CONTACT WITH THE MOLTEN IRON.
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) | 1965-08-27 | 1966-02-26 | 1966-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-27 | 1970-02-26 | 1970-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-27 | 1974-02-26 | 1974-08-28 | $7700.00 | Window Closed / Lapsed |