Patent US2726487A successfully refreshed from Google Patents.
US2726487A
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Method for making fused vitreous quartz
Assignee: General Electric Co
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Filing: 1952-11-21
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Granted: 1955-12-13
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Expires: 1972-11-21
Abstract
No abstract record available.
Inventors
- 👤 Robert K Cummins
- 👤 Robert J Sommer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:43
CPC Classifications
C; C03; C03B; C03B1/00; C03B1/02; C03B19/00; C03B19/09; Y; Y10; Y10S; Y10S65/00; Y10S65/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
183 words
THE METHOD OF MAKING FUSED VITREOUS QUARTZ WHICH COMPRISES THE STEPS OF MOLDING A MASS OF PURE QUARTZ SAND INTO A FLAT SHAPE, REDUCING THE POROSITY OF SAID SHAPED MASS AND CAUSING THE SAND GRAINS IN SAID MASS TO COHERE TO FORM A FLAT CAKE BY SUCCESSIVE TREATMENTS OF SAID MOLDED MASS WITH A HYDROLIZED ETHYL ORTHOSILICATE SOLUTION CONTAINING ABOUT 1 PERCENT BY VOLUME OF 10 PERCENT HYDROCHLORIC ACID, EACH OF SAID TREATMENTS CONSISTING OF SOAKING SAID MASS WITH SAID SOLUTION AND THEREAFTER HEATING SAID MASS IN THE MOLD TO A TEMPERATURE OF ABOUT 55* C., TO DRIVE OFF THE ALCOHOL AND THEN TO A TEMPERATURE OF ABOUT 1000* C. TO DRIVE OFF THE WATER, REMOVING THE CAKE FROM THE MOLD WHEN SO FORMED, THEN CONTINUING THE SAID TREATMENTS OF SAID MASS TO REDUCE ITS POROSITY TO LESS THAN ABOUT 25 PERCENT, AND THEREAFTER HEATING SAID CAKE IN A GRAPHITE CRUCIBLE IN A VACUUM TO THE FUSION TEMPERATURE OF QUARTZ FOR A TIME SUFFICIENT TO CAUSE COALESCENCE OF THE QUARTZ SAND INTO A CLEAR, HOMOGENEOUS, SUBSTANTIALLY PURE AND BUBBLE FREE VITREOUS QUARTZ DISC.
Claim 2
Independent Claim
183 words
THE METHOD OF MAKING FUSED VITREOUS QUARTZ WHICH COMPRISES THE STEPS OF MOLDING A MASS OF PURE QUARTZ SAND INTO A FLAT SHAPE, REDUCING THE POROSITY OF SAID SHAPED MASS AND CAUSING THE SAND GRAINS IN SAID MASS TO COHERE TO FORM A FLAT CAKE BY SUCCESSIVE TREATMENTS OF SAID MOLDED MASS WITH A HYDROLIZED ETHYL ORTHOSILICATE SOLUTION CONTAINING ABOUT 1 PERCENT BY VOLUME OF 10 PERCENT HYDROCHLORIC ACID, EACH OF SAID TREATMENTS CONSISTING OF SOAKING SAID MASS WITH SAID SOLUTION AND THEREAFTER HEATING SAID MASS IN THE MOLD TO A TEMPERATURE OF ABOUT 55* C., TO DRIVE OFF THE ALCOHOL AND THEN TO A TEMPERATURE OF ABOUT 1000* C. TO DRIVE OFF THE WATER, REMOVING THE CAKE FROM THE MOLD WHEN SO FORMED, THEN CONTINUING THE SAID TREATMENTS OF SAID MASS TO REDUCE ITS POROSITY TO LESS THAN ABOUT 25 PERCENT, AND THEREAFTER HEATING SAID CAKE IN A GRAPHITE CRUCIBLE IN A VACUUM TO THE FUSION TEMPERATURE OF QUARTZ FOR A TIME SUFFICIENT TO CAUSE COALESCENCE OF THE QUARTZ SAND INTO A CLEAR, HOMOGENEOUS, SUBSTANTIALLY PURE AND BUBBLE FREE VITREOUS QUARTZ DISC.
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) | 1958-12-12 | 1959-06-13 | 1959-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-12 | 1963-06-13 | 1963-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-12 | 1967-06-13 | 1967-12-13 | $7700.00 | Window Closed / Lapsed |