US3428438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Potassium tantalate niobate crystal growth from a melt
Assignee: Raytheon Co
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Filing: 1966-11-14
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Granted: 1969-02-18
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Expires: 1986-11-14
Abstract
No abstract record available.
Inventors
- 👤 Frank H Andres
- 👤 Anthony L Gentile
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:42
CPC Classifications
C; C30; C30B; C30B29/00; C30B29/10; C30B29/16; C30B29/22; C30B17/00; C30B29/30; C30B9/00; H; H01; H01G; H01G7/00; H01G7/02; H01G7/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
175 words
THE METHOD OF GROWING A HOMOGENEOUS KTN CRYSTAL WEIGHING ON THE ORDER OF FROM 34 GRAMS TO 142 GRAMS OF A SIZE RANGING ON THE ORDER OF FROM 30 X 30 X 5 MM. TO 40 X 40 X 30 MM., HAVING A CURIE TEMPERATURE WITHIN A RANGE OF +16* C. TO -52* C., $3*C., AND HIGH OPTICAL QUALITY COMPRISING THE STEPS: (1) PREPARING A CRYSTAL FORMING LIQUID MIXTURE OF KTAXNB1-XO3 AND 1>X>0 IN THE PRESENCE OF K2O AT CRYSTAL MELTING TEMPERATURE; (2) REDUCING THE TEMPERATURE OF SAID MIXTURE AND MAINTAINING THE SAID MIXTURE AT A SUBSTANTIALLY CONSTANT TEMPERATURE OF EQUILIBRIUM MIXTURE OF LIQUID AND SOLID; (3) SUSPENDING A SEED CRYSTAL OF KTN COMPOSITION ABOUT 5 MM. BELOW THE SURFACE OF SAID MIXTURE; (4) MAINTAINING THE SAID MIXTURE AT A SUBSTANTIALLY CONSTANT TEMPERATURE THROUGHOUT CRYSTAL GROWTH AND WITH THE SEED CRYSTAL SUSPENDED THEREIN; (5) EFFECTING THE DEFINED CRYSTAL GROWTH FOR A PERIOD OF ABOUT FOUR TO FIVE DAYS; (6) WITH DRAWING THE GROWN CRYSTAL FROM THE SAID MIXTURE AND COOLING SAID CRYSTAL TO ROOM TEMPERATURE.
Claim 2
Independent Claim
175 words
THE METHOD OF GROWING A HOMOGENEOUS KTN CRYSTAL WEIGHING ON THE ORDER OF FROM 34 GRAMS TO 142 GRAMS OF A SIZE RANGING ON THE ORDER OF FROM 30 X 30 X 5 MM. TO 40 X 40 X 30 MM., HAVING A CURIE TEMPERATURE WITHIN A RANGE OF +16* C. TO -52* C., $3*C., AND HIGH OPTICAL QUALITY COMPRISING THE STEPS: (1) PREPARING A CRYSTAL FORMING LIQUID MIXTURE OF KTAXNB1-XO3 AND 1>X>0 IN THE PRESENCE OF K2O AT CRYSTAL MELTING TEMPERATURE; (2) REDUCING THE TEMPERATURE OF SAID MIXTURE AND MAINTAINING THE SAID MIXTURE AT A SUBSTANTIALLY CONSTANT TEMPERATURE OF EQUILIBRIUM MIXTURE OF LIQUID AND SOLID; (3) SUSPENDING A SEED CRYSTAL OF KTN COMPOSITION ABOUT 5 MM. BELOW THE SURFACE OF SAID MIXTURE; (4) MAINTAINING THE SAID MIXTURE AT A SUBSTANTIALLY CONSTANT TEMPERATURE THROUGHOUT CRYSTAL GROWTH AND WITH THE SEED CRYSTAL SUSPENDED THEREIN; (5) EFFECTING THE DEFINED CRYSTAL GROWTH FOR A PERIOD OF ABOUT FOUR TO FIVE DAYS; (6) WITH DRAWING THE GROWN CRYSTAL FROM THE SAID MIXTURE AND COOLING SAID CRYSTAL TO ROOM TEMPERATURE.
References Cited (Backward Citations)
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US3129061A
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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) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |