US3723337A
Expired / Lapsed
US
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Hydrothermal process for growing crystals having the structure of beryl in highly acid chloride medium
Assignee: Union Carbide Corp
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Filing: 1970-08-03
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Granted: 1973-03-27
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Expires: 1990-08-03
Abstract
Abstract A hydrothermal process for growing relatively large macrocrystals having the structure of beryl. Growth takes place on seed crystals from an aqueous medium which has a chloride ion concentration of at least 4 molar and contains sufficient hydrochloric acid to give a final pH of not greater than 0.1.
Inventors
- 👤 P Yancey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:47
CPC Classifications
C; C30; C30B; C30B7/00; C30B29/00; C30B29/10; C30B29/34
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
49 words
The process in accordance with claim 1 wherein said sources of oxides of beryllium, aluminum and silicon are present in amounts which provide substantially the stoichiometric amounts of beryllium, aluminum and silicon oxides in the composition of an ideal beryl crystal (3.0 BeO . 1.0 Al2O3 . 6.0 SiO2).
Claim 2
Dependent Claim
50 words
The process in accordance with claim 1 wherein said acidic aqueous reactant mixture consists essentially of (a) sources of the oxides of beryllium, aluminum and silicon, (b) hydrochloric acid, and (c) minor amounts of sources of ions of one or more of the dopant metals vanadium, chromium, manganese and iron.
Claim 3
Dependent Claim
13 words
The process in accordance with claim 3 wherein saId dopant metal is chromium.
Claim 4
Dependent Claim
96 words
The process in accordance with claim 3 wherein (1) said sources of oxides of beryllium and aluminum are disposed near the bottom of a closed reaction vessel, said sources of oxides of silicon are disposed near the top of said vessel, and said seed crystal has the structure of beryl and is supported between said sources of oxides of beryllium and aluminum and said sources of oxides of silicon, and (2) wherein the temperature at the bottom of said reaction vessel is at least 10* C. higher than the temperature at the top of said vessel.
Claim 5
Dependent Claim
78 words
The process in accordance with claim 5 wherein said aqueous reactant mixture is substantially free from fluoride ion and wherein said source of dopant metal is CrCl3 . 6 H2 O which is present in said reactant mixture in sufficient amount to supply from 0.01 to 2 weight percent chromium ion in said crystal based on the weight of ideal beryl crystal theoretically equivalent to the weight of aluminum, beryllium and silicon oxides present in said oxide sources.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |