US2638408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of synthesizing large single crystals of quartz
Assignee: Individual
•
Filing: 1948-07-06
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Granted: 1953-05-12
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Expires: 1968-07-06
Abstract
No abstract record available.
Inventors
- 👤 Isidore I Friedman
- 👤 Orville F Tuttle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:23
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A METHOD OF GROWING LARGER CRYSTALS OF QUARTZ BY DEPOSITION OF QUARTZ FROM SOLUTION ONTO CRYSTAL SEED QUARTZ WHICH COMPRISES COOLING IN A CLOSED SYSTEM IN THE PRESENCE OF CRYSTAL SEED QUARTZ A HOT BODY OF AQUEOUS SODIUM SILICATE SOLUTION WHICH IS IN EQUILIBRIUM SATURATION WITH RESPECT TO QUART, HAS A SODIUM OXIDE EQUIVALENT EQUAL TO A CONCENTRATION OF FROM ABOUT 0.5 TO ABOUT 20% BY WEIGHT OF SODIUM HYDROXIDE AND IS AT A TEMPERATURE WITHIN THE RANGE OF BETWEEN ABOUT 250 AND ABOUT 450* C., AND CONDUCTING THE COOLING OF SAID SOLUTION AT A RATE SUCH THAT WHILE QUARTZ IS DEPOSITED THEREFROM ONTO THE CRYSTAL SEED QUARTZ, THE RESULTING SOLUTION ATTAINS EQUILIBRIUM SATURATION WITH RESPECT TO QUARTZ AT EACH SUCCEEDING LOWER TEMPERATURE LEVEL.
Claim 2
Independent Claim
124 words
A METHOD OF GROWING LARGER CRYSTALS OF QUARTZ BY DEPOSITION OF QUARTZ FROM SOLUTION ONTO CRYSTAL SEED QUARTZ WHICH COMPRISES COOLING IN A CLOSED SYSTEM IN THE PRESENCE OF CRYSTAL SEED QUARTZ A HOT BODY OF AQUEOUS SODIUM SILICATE SOLUTION WHICH IS IN EQUILIBRIUM SATURATION WITH RESPECT TO QUART, HAS A SODIUM OXIDE EQUIVALENT EQUAL TO A CONCENTRATION OF FROM ABOUT 0.5 TO ABOUT 20% BY WEIGHT OF SODIUM HYDROXIDE AND IS AT A TEMPERATURE WITHIN THE RANGE OF BETWEEN ABOUT 250 AND ABOUT 450* C., AND CONDUCTING THE COOLING OF SAID SOLUTION AT A RATE SUCH THAT WHILE QUARTZ IS DEPOSITED THEREFROM ONTO THE CRYSTAL SEED QUARTZ, THE RESULTING SOLUTION ATTAINS EQUILIBRIUM SATURATION WITH RESPECT TO QUARTZ AT EACH SUCCEEDING LOWER TEMPERATURE LEVEL.
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) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |