US2837428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of sintering chromium-alumina metal ceramics
Assignee: Union Carbide Corp
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Filing: 1954-04-28
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Granted: 1958-06-03
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Expires: 1974-04-28
Abstract
No abstract record available.
Inventors
- 👤 Harry J Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:19
CPC Classifications
C; C22; C22C; C22C32/00; C22C32/001; C22C32/0015; C22C32/0026
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
IN A PROCESS FOR PRODUCING AN ARTICLE OF SUBSTANTIALLY ELONGATED SHAPE FROM METAL CERAMIC MATERIAL CONSISTING ESSENTIALLY OF CHROMIUM AND ALUMINA, WHEREIN CHROMIUM CONSTITUTES THE MAJOR CONSTITUENT OF SAID METAL CERAMIC, THE PROCESS OF MINIMIZING CRACKING DURING HEAT HARDENING COMPRISING FORMING THE ARTICLE TO SAID ELONGATED SHAPE IN THE GREEN STATE, HEATING THE ARTICLE TO A TEMPERATURE BETWEEN 500*C. AND 1000*C. IN AN OXIDIZING ATMOSPHERE TO INCREASE THE GREEN STRENGTH OF SAID ARTICLE, AND THEN SINTERING SAID ARTICLE IN A NON-CONTAMINATING ATMOSPHERE UNTIL SINTERING OF SAID ARTICLE IS COMPLETE.
Claim 2
Dependent Claim
89 words
IN A PROCESS FOR PRODUCING AN ARTICLE OF SUBSTANTIALLY ELONGATED SHAPE FROM METAL CERAMIC MATERIAL CONSISTING ESSENTIALLY OF CHROMIUM AND ALUMINA, WHEREIN CHROMIUM CONSTITUTES THE MAJOR CONSTITUENT OF SAID METAL CERAMIC, THE PROCESS OF MINIMIZING CRACKING DURING HEAT HARDENING COMPRISING FORMING THE ARTICLE TO SAID ELONGATED SHAPE IN THE GREEN STATE, HEATING THE ARTICLE TO A TEMPERATURE BETWEEN 500*C. AND 1000*C. IN AN OXIDIZING ATMOSPHERE TO INCREASE THE GREEN STRENGTH OF SAID ARTICLE, AND THEN SINTERING SAID ARTICLE IN A NON-CONTAMINATING ATMOSPHERE UNTIL SINTERING OF SAID ARTICLE IS COMPLETE.
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) | 1961-06-02 | 1961-12-02 | 1962-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-02 | 1965-12-02 | 1966-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-02 | 1969-12-02 | 1970-06-03 | $7700.00 | Window Closed / Lapsed |