US2546142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical heating rod and method of making same
Assignee: Saint Gobain Abrasives Inc
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Filing: 1950-03-30
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Granted: 1951-03-27
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Expires: 1970-03-30
Abstract
No abstract record available.
Inventors
- 👤 George R Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:06
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; H05B3/148; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/2933; Y10T428/2971
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A METHOD OF MAKING COLD ENDS FOR SILICON CARBIDE ELECTRICAL HEATING RODS WHICH COMPRISES PLACING A MIXTURE OF SILICON AND BORIDE SELECTED FROM THE GROUP CONSISTING OF CARBON, TITANIUM AND ZIRCONIUM BORIDES AND MIXTURES THEREOF ADJACENT A LENGTH OF RECRYSTALLIZED SILICON CARBIDE AND HEATING THE MIXTURE TO A TOP TEMPERATURE BETWEEN 1800* C. AND 2600* C., THE PERCENTAGE OF BORON ON THE SILICON BY WEIGHT IN THE MIXTURE BEING BETWEEN 0.078% AND 5%.
Claim 2
Independent Claim
73 words
A METHOD OF MAKING COLD ENDS FOR SILICON CARBIDE ELECTRICAL HEATING RODS WHICH COMPRISES PLACING A MIXTURE OF SILICON AND BORIDE SELECTED FROM THE GROUP CONSISTING OF CARBON, TITANIUM AND ZIRCONIUM BORIDES AND MIXTURES THEREOF ADJACENT A LENGTH OF RECRYSTALLIZED SILICON CARBIDE AND HEATING THE MIXTURE TO A TOP TEMPERATURE BETWEEN 1800* C. AND 2600* C., THE PERCENTAGE OF BORON ON THE SILICON BY WEIGHT IN THE MIXTURE BEING BETWEEN 0.078% AND 5%.
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) | 1954-03-26 | 1954-09-25 | 1955-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-26 | 1958-09-25 | 1959-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-26 | 1962-09-25 | 1963-03-27 | $7700.00 | Window Closed / Lapsed |