US3567642A
Expired / Lapsed
US
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Hydrothermal process for growing crystals having the structure of beryl in an alkaline halide medium
Assignee: Union Carbide Corp
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Filing: 1968-03-25
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Granted: 1971-03-02
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Expires: 1988-03-25
Abstract
Abstract A HYDROTHERMAL PROCESS FOR GROWING RELATIVELY LARGE MACRO-CRYSTALS HAVING THE STRUCTURE OF BERYL. GROWTH TAKES PLACE ON SEED CRYSTALS FROM AN ALKALINE MEDIUM WHICH INCLUDES ALKALI METAL AND/OR AMMONIUM HALIDES.
Inventors
- 👤 Edith M Flanigen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:38
CPC Classifications
C; C30; C30B; C30B7/00; C30B29/00; C30B29/10; C30B29/34; Y; Y10; Y10S; Y10S117/00; Y10S117/901; Y10S117/902
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References 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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |