US3371995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making macroscopic silicon carbide fibers with a silica sheath
Assignee: Corning Glass Works
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Filing: 1965-07-09
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Granted: 1968-03-05
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Expires: 1985-07-09
Abstract
No abstract record available.
Inventors
- 👤 Wallace W Pultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:30
CPC Classifications
C; C30; C30B; C30B25/00; C30B25/005; C30B29/00; C30B29/10; C30B29/36; Y; Y10; Y10S; Y10S148/00; Y10S148/148
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A METHOD FOR MANUFACTURING MACROSCOPIC FIBERS CONTAINING BETA-SILICON CARBIDE CRYSTALS WITH A SURFACE SHEATH OF SILICA COMPRISING THE STEPS OF PROVIDING A MIXTURE OF CARBON AND SILICA IN A MOLAR RATIO RANGING BETWEEN ABOUT 1:1 TO 5:1 IN A REACTION CHAMBER, CONTACTING SAID MIXTURE AT A TEMPERATURE RANGING ABOUT 1300*-1550*C. WITH AN ATOMOSPHERE CONTAINING AT LEAST ONE HALIDE GAS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN FLUORIDE, HYDROGEN CHLORIDE, HYDROGEN BROMIDE, AND SILICON TETRACHLORIDE, THE HALIDE GAS HAVING A PARTIAL PRESSURE RANGING ABOUT 25-350 MM. OF MERCURY, MAINTAINING SAID TEMPERATURE AND ATMOSPHERE FOR A PERIOD OF TIME SUFFICIENT TO ATTAIN THE DESIRED FIBER FORMATION AFTER WHICH THE FIBERS ARE COOLED TO ROOM TEMPERTURE.
Claim 2
Independent Claim
113 words
A METHOD FOR MANUFACTURING MACROSCOPIC FIBERS CONTAINING BETA-SILICON CARBIDE CRYSTALS WITH A SURFACE SHEATH OF SILICA COMPRISING THE STEPS OF PROVIDING A MIXTURE OF CARBON AND SILICA IN A MOLAR RATIO RANGING BETWEEN ABOUT 1:1 TO 5:1 IN A REACTION CHAMBER, CONTACTING SAID MIXTURE AT A TEMPERATURE RANGING ABOUT 1300*-1550*C. WITH AN ATOMOSPHERE CONTAINING AT LEAST ONE HALIDE GAS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN FLUORIDE, HYDROGEN CHLORIDE, HYDROGEN BROMIDE, AND SILICON TETRACHLORIDE, THE HALIDE GAS HAVING A PARTIAL PRESSURE RANGING ABOUT 25-350 MM. OF MERCURY, MAINTAINING SAID TEMPERATURE AND ATMOSPHERE FOR A PERIOD OF TIME SUFFICIENT TO ATTAIN THE DESIRED FIBER FORMATION AFTER WHICH THE FIBERS ARE COOLED TO ROOM TEMPERTURE.
References Cited (Backward Citations)
US3161473A
Cited
US3335049A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-05 | 1971-09-04 | 1972-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-05 | 1975-09-04 | 1976-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-05 | 1979-09-04 | 1980-03-05 | $7700.00 | Window Closed / Lapsed |