US4579622A
Expired / Lapsed
US
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Hydrothermal crystal growth processes
Assignee: Nokia Bell Labs
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Filing: 1983-10-17
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Granted: 1986-04-01
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Expires: 2003-10-17
Abstract
Abstract High quality crystals of materials that are essentially silicon-free are produced in a low pressure hydrothermal growth process through a specific expedient. In particular, the aqueous solution utilized in the pressure vessel during growth is introduced in significantly larger quantities than previously thought to be acceptable.
Inventors
- 👤 Anthony J. Caporaso
- 👤 Ernest D. Kolb
- 👤 Robert A. Laudise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:56
CPC Classifications
C; C30; C30B; C30B7/00; C30B7/10; C30B29/00; C30B29/10; C30B29/14; Y; Y10; Y10S; Y10S117/00; Y10S117/90
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
86 words
A process for growth of an essentially silicon-free crystal at an elevated growth temperature comprising the steps of partially filling a pressure vessel having internal surfaces comprising a noble metal with an aqueous growth medium that contains a mineralizer in the presence of a nutrient for growth of said crystal and inducing growth of said crystal at said growth temperature wherein said partial fill is sufficient to cause complete fill of said vessel at said growth temperature but insufficient to produce a pressure above 15,000 psi.
Claim 2
Dependent Claim
86 words
A process for growth of an essentially silicon-free crystal at an elevated growth temperature comprising the steps of partially filling a pressure vessel having internal surfaces comprising a noble metal with an aqueous growth medium that contains a mineralizer in the presence of a nutrient for growth of said crystal and inducing growth of said crystal at said growth temperature wherein said partial fill is sufficient to cause complete fill of said vessel at said growth temperature but insufficient to produce a pressure above 15,000 psi.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein said minerlizer and said nutrient are selected such that said crystal comprises AlPO 4 .
Claim 4
Dependent Claim
12 words
The process of claim 2 wherein said aqueous medium comprises hydrochloric acid.
Claim 5
Dependent Claim
12 words
The process of claim 2 wherein said aqueous medium comprises phosphoric acid.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein said aqueous medium comprises hydrochloric acid.
Claim 7
Dependent Claim
13 words
The process of claim 1 wherein said aqueous medium comprises a phosphoric acid.
Claim 8
Dependent Claim
14 words
The process of claim 1 wherein said internal surfaces comprise a metal vessel liner.
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) | 1989-03-31 | 1989-09-30 | 1990-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-31 | 1993-09-30 | 1994-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-31 | 1997-09-30 | 1998-04-01 | $7700.00 | Window Closed / Lapsed |