Patent US3338679A successfully refreshed from Google Patents.
US3338679A
Expired / Lapsed
US
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Method for producing boron carbide
Assignee: Hitachi Ltd
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Filing: 1963-12-31
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Granted: 1967-08-29
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Expires: 1983-12-31
Abstract
No abstract record available.
Inventors
- 👤 Muta Akinori
- 👤 Gejo Tetsuo
- 👤 Shiozawa Masao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:16
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/991
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
A PROCESS FOR THE PRODUCTION OF BORON CARBIDE WHICH COMPRISES ADDING TO B2O3, CARBON AND MAGNESIUM, SUBSTANTAILLY IN THEIR THEORETICAL PROPORTIONS, A CATALYST SELECTED FROM THE GROUP CONSISTING OF POTASSIUM SULFATE, SODIUM SULFATE, ALUMINUM SULFATE, MAGNESIUM SULFATE, COPPER SULFATE, NICKEL SULFATE, OR CALCIUM SULFATE, HEATING THE RESULTANT MIXTURE AT A TEMPERATURE OF SUBSTANTIALLY 650-830*C., AND RECOVERING THE BORON CARBIDE THUS FORMED FROM THE REACTION PRODUCT.
Claim 2
Dependent Claim
65 words
A PROCESS FOR THE PRODUCTION OF BORON CARBIDE WHICH COMPRISES ADDING TO B2O3, CARBON AND MAGNESIUM, SUBSTANTAILLY IN THEIR THEORETICAL PROPORTIONS, A CATALYST SELECTED FROM THE GROUP CONSISTING OF POTASSIUM SULFATE, SODIUM SULFATE, ALUMINUM SULFATE, MAGNESIUM SULFATE, COPPER SULFATE, NICKEL SULFATE, OR CALCIUM SULFATE, HEATING THE RESULTANT MIXTURE AT A TEMPERATURE OF SUBSTANTIALLY 650-830*C., AND RECOVERING THE BORON CARBIDE THUS FORMED FROM THE REACTION PRODUCT.
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) | 1970-08-28 | 1971-02-27 | 1971-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-28 | 1975-02-27 | 1975-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-28 | 1979-02-27 | 1979-08-29 | $7700.00 | Window Closed / Lapsed |