Patent US2283545A successfully refreshed from Google Patents.
US2679080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of single crystals of germanium
Assignee: AT&T Inc
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Filing: 1949-12-30
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Granted: 1954-05-25
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Expires: 1969-12-30
Abstract
No abstract record available.
Inventors
- 👤 Karl M Olsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:25
CPC Classifications
C; C30; C30B; C30B11/00; C30B11/002
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
133 words
THE METHOD OF PREPARING SINGLE CRYSTALS OF FUSIBLE CRYSTALLIZABLE MATERIAL WHICH COMPRISES MELTING A PLURALITY OF SIMILAR AND SUBSTANTIALLY EQUAL AND DISTINCT MASSES OF SAID MATERIAL IN CONTAINERS OF MATERIAL INERT TO SAID FUSIBLE MATERIAL WHILE IN A FLOWING ATMOSPHERE INCAPABLE OF COMBINING CHEMICALLY WITH THE FUSIBLE MATEIAL, MAINTAINING SAID CONTAINERS ALIGNED IN THE DIRECTION OF ATMOSPHERIC FLOW AND IN CONTACT TO ESTABLISH AND EFFECTIVE HEAT TRANSFER RELATIONSHIP BETWEEN SAID MASSES, MAINTAINING ALL OF THE MOLTEN MASSES AT APPROXIMATELY THE SAME TEMPERATURE ABOVE THE MELTING POINT FOR A PERIOD OF ABOUT FIVE HOURS TO ESTABLISH THERMAL EQUILIBRIUM, MAINTAINING THE MELTED MASSES IN A SUBSTANTIALLY QUIESCENT STATE UNTIL THEY ARE FROZEN, SLOWLY COOLING A FIRST OF SAID MASSES TO THE FREEZING TEMPERATURE OF SAID MATERIAL TO INITATE FREEZING THEREIN WHILE MAINTAINING THE REMAINING MASSES
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) | 1957-05-24 | 1957-11-23 | 1958-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-24 | 1961-11-23 | 1962-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-24 | 1965-11-23 | 1966-05-25 | $7700.00 | Window Closed / Lapsed |