US2839426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of coating carbonaceous articles with silicon nitride
Assignee: Union Carbide Corp
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Filing: 1954-01-21
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Granted: 1958-06-17
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Expires: 1974-01-21
Abstract
No abstract record available.
Inventors
- 👤 Russell W Gerby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:30
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/5053; C04B41/5062; C04B41/5066; C04B41/80; C04B41/81; C04B41/85; C04B41/87
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A PROCESS FOR IMPROVING THE RESISTANCE TO OXIDATION AT HIGH TEMPERATURES OF A NORMALLY FRAGILE GRAPHITE ARTICLE HAVING NORMALLY OCCURRING ANASTOMOZED PORES AND IMPARTING ABRASION RESISTANCE THERETO, COMPRISING PLACING SAID GRAPHITE ARTICLE IN A NITROGEN CONTAINING FURNACE, PROVIDING IN SAID FURNACE POWDERED SILICON METAL OF MESH SIZE 20+100 IN CONTACT WITH THE NITROGEN IN SAID FURNACE AND ALUMINUM OXIDE, AND HEATING THE CONTENTS OF SAID FURNACE TO BETWEEN 1000*C. AND 1600*C. TO ENABLE SAID SILICON METAL TO VAPORIZE AND FORM SILICON NITRIDE, AND MAINTAINING SAID TEMPERATURE FOR APPROXIMATELY 48 HOURS TO ALLOW A SUITABLE ACCUMULATION OF SILICON NITRIDE DEPOSIT TO FORM ON EXPOSED SURFACES OF SAID ARTICLE, WHEREBY SAID SILICON NITRIDE IS PRESENT IN THE ANASTOMOZED PORES OF SAID ARTICLE ON THE SURFACE THEREOF AND BONDED TO THE ANASTOMOZED PORES AND SURFACE OF SAID ARTICLE.
Claim 2
Dependent Claim
135 words
A PROCESS FOR IMPROVING THE RESISTANCE TO OXIDATION AT HIGH TEMPERATURES OF A NORMALLY FRAGILE GRAPHITE ARTICLE HAVING NORMALLY OCCURRING ANASTOMOZED PORES AND IMPARTING ABRASION RESISTANCE THERETO, COMPRISING PLACING SAID GRAPHITE ARTICLE IN A NITROGEN CONTAINING FURNACE, PROVIDING IN SAID FURNACE POWDERED SILICON METAL OF MESH SIZE 20+100 IN CONTACT WITH THE NITROGEN IN SAID FURNACE AND ALUMINUM OXIDE, AND HEATING THE CONTENTS OF SAID FURNACE TO BETWEEN 1000*C. AND 1600*C. TO ENABLE SAID SILICON METAL TO VAPORIZE AND FORM SILICON NITRIDE, AND MAINTAINING SAID TEMPERATURE FOR APPROXIMATELY 48 HOURS TO ALLOW A SUITABLE ACCUMULATION OF SILICON NITRIDE DEPOSIT TO FORM ON EXPOSED SURFACES OF SAID ARTICLE, WHEREBY SAID SILICON NITRIDE IS PRESENT IN THE ANASTOMOZED PORES OF SAID ARTICLE ON THE SURFACE THEREOF AND BONDED TO THE ANASTOMOZED PORES AND SURFACE OF SAID ARTICLE.
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) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |