Sintered ceramic
Abstract
Abstract A CRYSTALLIZED SINTERED GLASS ARTICLE HAVING A NON-POROUS SURFACE AND A METHOD FOR FORMING THE ARTICLE. CRYSTALLIZABLE PARTICULATE GLASS THAT IS CRYSTALLIZABLE BY IN SITU CRYSTALLIZATION TO A GLASS-CERAMIC IS FIRST ARRANGED INTO A DESIRED COHERENT BUT UNFIRED SHAPED ARTICLE. THE ARTICLE IS THEN SINTERED TO FORM A POROUS GLASS ARTICLE WHICH IS THEN THERMALLY CRYSTALLIZED AT A TEMPERATURE HIGHER THAN THAT EMPLOYED TO EFFECT THE SINTERING. A POROUS GLASS-CERAMIC IS THUS FORMED HAVING DISPERSED THROUGHOUT A MULTITUDE OF CRYSTALS OF A PLURALITY OF CRYSTALLINE SPECIES HAVING A PLURALITY OF DIFFERENT MELTING POINTS. THE POROUS GLASS-CERAMIC ARTICLE IS THEN HEATED AT A STILL HIGHER TEMPERATURE SUFFICIENT TO MELT A PORTION BUT NOT ALL OF THE CRYSTALS AND FORM A NON-POROUS SURFACE ON THE GLASS-CERAMIC.
Inventors
- 👤 G Wojcik
- 👤 W Lawson
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |