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US4654111A
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Hydrothermal growth of potassium titanyl phosphate
Assignee: AT&T Labs Inc
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Filing: 1985-12-02
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Granted: 1987-03-31
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Expires: 2005-12-02
Abstract
Abstract Crystals of potassium titanyl phosphate suitable for device applications are grown by a hydrothermal process. By maintaining the growth temperature substantially below conventional levels, the crystal growth rate is maintained, and noble metal-lined vessels are employable.
Inventors
- 👤 Robert A. Laudise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:33
CPC Classifications
C; C30; C30B; C30B7/00; C30B29/00; C30B29/10; C30B29/14
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
110 words
A hydrothermal process for growing a crystal of potassium titanyl phosphate comprising the steps of (1) providing in a pressure vessel (a) means for nucleating said crystal in a growth region, (b) a growth medium comprising nutrient and a mineralizer in a nutrient region, and (c) means for producing a temperature gradient between said growth region and said nutrient region and (2) producing a growth temperature in said growth region and a nutrient temperature in said nutrient region wherein said growth temperature is lower than said nutrient temperature whereby growth of said crystal is initiated characterized in that said growth temperature is in the range 350 to 425 degrees C.
Claim 2
Dependent Claim
110 words
A hydrothermal process for growing a crystal of potassium titanyl phosphate comprising the steps of (1) providing in a pressure vessel (a) means for nucleating said crystal in a growth region, (b) a growth medium comprising nutrient and a mineralizer in a nutrient region, and (c) means for producing a temperature gradient between said growth region and said nutrient region and (2) producing a growth temperature in said growth region and a nutrient temperature in said nutrient region wherein said growth temperature is lower than said nutrient temperature whereby growth of said crystal is initiated characterized in that said growth temperature is in the range 350 to 425 degrees C.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein said growth temperature is in the range 375 to 400 degrees C.
Claim 4
Dependent Claim
18 words
The process of claim 2 wherein said nutrient temperature is in the range 375 to 450 degrees C.
Claim 5
Dependent Claim
18 words
The process of claim 2 wherein said nutrient temperature is in the range 400 to 425 degrees C.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein said nutrient temperature is in the range 375 to 450 degrees C.
Claim 7
Dependent Claim
18 words
The process of claim 1 wherein said nutrient temperature is in the range 400 to 425 degrees C.
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein said vessel comprises low carbon steel.
Claim 9
Dependent Claim
13 words
The process of claim 1 wherein said nucleating means comprises a seed crystal.
Claim 10
Dependent Claim
21 words
The process of claim 1 wherein said mineralizer comprises a composition having a potassium-to-phosphorus ratio in the range 1.25 to 3.0.
Claim 11
Dependent Claim
16 words
The process of claim 9 wherein said mineralizer is formed from K 2 HPO 4 .
Claim 12
Dependent Claim
18 words
The process of claim 9 wherein said growth temperature is in the range 375 to 400 degrees C.
Claim 13
Dependent Claim
14 words
The process of claim 9 wherein said mineralizer comprises K 2 HPO 4 .
Claim 14
Dependent Claim
17 words
The process of claim 12 wherein said growth temperature is the range 375 to 400 degrees C.
Claim 15
Dependent Claim
12 words
The process of claim 1 wherein said nutrient includes TiO 2 .
Claim 16
Dependent Claim
20 words
The process of claim 1 wherein said growth temperature is at least 25 degrees C. lower than said nutrient temperature.
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) | 1990-03-30 | 1990-09-29 | 1991-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-30 | 1994-09-29 | 1995-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-30 | 1998-09-29 | 1999-03-31 | $7700.00 | Window Closed / Lapsed |