US3137590A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making cold ends for silicon carbide resistor bars
Assignee: Saint Gobain Abrasives Inc
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Filing: 1960-07-19
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Granted: 1964-06-16
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Expires: 1980-07-19
Abstract
No abstract record available.
Inventors
- 👤 Samuel H Coes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:25
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; H05B3/148
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A METHOD OF MAKING A COLD END FOR AN ELECTRICAL RESISTOR BAR, SAID END BEING FORMED OF RECRYSTALLIZED SILICON CARBIDE MATERIAL COMPRISING THE STEPS OF IMPREGNATING THE PORES OF THE RECRYSTALLIZED SILICON CARBIDE OF HEXAGONAL FORM BY IMMERSING IT IN A LIQUID SUSPENSION OF GRAPHITE, REMOVING THE LIQUID, AND THEN FURTHER IMPREGNATING THE PORES OF THE RECXRYSTALLIZED SILICON CARBIDE WITH A MATERIAL SELECTED FROM THE GROUP CONSISTING OF MOLYBDENUM SILICIDE AND SILICON, AND MIXTURES THEREOF, BY IMMERSING IT IN A MOLTEN BATH OF SAID MATERIAL, HOLDING SAID BATH AT A TEMPERATURE OF BETWEEN 2100*C. AND 2300*C., AND REACTING THE MATERIAL AND THE GRAPHITE TO FORM A SMALL AMOUNT OF SILICON CARBIDE IN THE PORES AND ALSO LEAVIND A MAJORITY OF THE MATERIAL THEREIN.
Claim 2
Independent Claim
123 words
A METHOD OF MAKING A COLD END FOR AN ELECTRICAL RESISTOR BAR, SAID END BEING FORMED OF RECRYSTALLIZED SILICON CARBIDE MATERIAL COMPRISING THE STEPS OF IMPREGNATING THE PORES OF THE RECRYSTALLIZED SILICON CARBIDE OF HEXAGONAL FORM BY IMMERSING IT IN A LIQUID SUSPENSION OF GRAPHITE, REMOVING THE LIQUID, AND THEN FURTHER IMPREGNATING THE PORES OF THE RECXRYSTALLIZED SILICON CARBIDE WITH A MATERIAL SELECTED FROM THE GROUP CONSISTING OF MOLYBDENUM SILICIDE AND SILICON, AND MIXTURES THEREOF, BY IMMERSING IT IN A MOLTEN BATH OF SAID MATERIAL, HOLDING SAID BATH AT A TEMPERATURE OF BETWEEN 2100*C. AND 2300*C., AND REACTING THE MATERIAL AND THE GRAPHITE TO FORM A SMALL AMOUNT OF SILICON CARBIDE IN THE PORES AND ALSO LEAVIND A MAJORITY OF THE MATERIAL THEREIN.
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) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |