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Patent US6442398B1 successfully refreshed from Google Patents.
US2985520A
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US
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Method for preparation of monocrystalline material
Assignee: NL Industries Inc
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Filing: 1958-08-11
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Granted: 1961-05-23
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Expires: 1978-08-11
Abstract
No abstract record available.
Inventors
- 👤 Merker Leon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:37
CPC Classifications
C; C30; C30B; C30B11/00; C30B11/04; C30B11/08; C30B11/10; C30B29/00; C30B29/10; C30B29/16; C30B29/22; C30B29/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A PROCESS FOR THE PREPARATION OF A DETWINNED CALCIUM TITANATE BOULE WHICH COMPRISES FUSING AND CRYSTALLIZING POWDERED CALCIUM TITANATE IN AN OXYHYDROGEN FLAME, SAID FLAME HAVING A TEMPERATURE FROM 1850*C. TO 1950*C., ANF FORM ING A CALCIUM TITANATE BOULE AND WITHOUT COOLING SAID BOULE TO A TEMPERATURE BELOW 1400* C., HEAT TREATING SAID BOULE IN AN OXIDIZING ATMOSPHERE AT A TEMPERATURE FROM 1400*C. TO ANNEAL SAID BOULE, SAID ANNEALED BOULE BEING SLIGHTLY TWINNED AND HEAT TREATING SAID ANNEALED BOULE AT A TEMPERATURE OF 1650*C. TO 1700*C. TO DETWIN SAID ANNEALED BOULE, SAID BOULE COOLED AT A RATE NOT EXCEEDING 50*C. PER HOUR AT A TEMPERATURE FROM 1800*C. TO 1000*C.
Claim 2
Dependent Claim
109 words
A PROCESS FOR THE PREPARATION OF A DETWINNED CALCIUM TITANATE BOULE WHICH COMPRISES FUSING AND CRYSTALLIZING POWDERED CALCIUM TITANATE IN AN OXYHYDROGEN FLAME, SAID FLAME HAVING A TEMPERATURE FROM 1850*C. TO 1950*C., ANF FORM ING A CALCIUM TITANATE BOULE AND WITHOUT COOLING SAID BOULE TO A TEMPERATURE BELOW 1400* C., HEAT TREATING SAID BOULE IN AN OXIDIZING ATMOSPHERE AT A TEMPERATURE FROM 1400*C. TO ANNEAL SAID BOULE, SAID ANNEALED BOULE BEING SLIGHTLY TWINNED AND HEAT TREATING SAID ANNEALED BOULE AT A TEMPERATURE OF 1650*C. TO 1700*C. TO DETWIN SAID ANNEALED BOULE, SAID BOULE COOLED AT A RATE NOT EXCEEDING 50*C. PER HOUR AT A TEMPERATURE FROM 1800*C. TO 1000*C.
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) | 1964-05-22 | 1964-11-21 | 1965-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-22 | 1968-11-21 | 1969-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-22 | 1972-11-21 | 1973-05-23 | $7700.00 | Window Closed / Lapsed |