US2750310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture process of doped germanium crystals
Assignee: Individual
•
Filing: 1955-07-07
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Granted: 1956-06-12
•
Expires: 1975-07-07
Abstract
No abstract record available.
Inventors
- 👤 Joachim I Franke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:17
CPC Classifications
C; C30; C30B; C30B15/00; C30B29/00; C30B29/02; C30B29/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A PROCESS FOR MANUFACTURING GERMANIUM CRYSTALS HAVING ZONES OR "LAYERS" OF SEMI-CONDUCTIVITY OF OPPOSITE TYPES, COMPRISING THE FOLLOWING STEPS: INTRODUCING, INTO A BATH CONSISTING OF A MOLTEN SEMI-CONDUCTIVE BODY WHICH HAS A MELTING POINT LOWER THAN THAT OF GERMANIUM AND CRYSTALLISES IN A CUBIC SYSTEM AND HAS A LATTICE DISTANCE OF THE ORDER OF 2.50 ANGSTROMS, A GERMANIUM CRYSTAL OF A GIVEN TYPE OF CONDUCTIVITY, FOR A TIME THAT IS SUFFICIENT FOR IT TO DISSOLVED TO SATURATION IN THE MOLTEN SEMI-CONDUCTIVE BODY AND, WHEN THE SATURATION EQUILIBRIUM HAS BEEN REACHED, INTRODUCING INTO THE SAME BATH A GERMANIUM CRYSTAL OF AN OPOSITE TYPE OF CONDUCTIVITY, THE TEMPERATURE BEING LOWERED SO THAT THE DISSOLVED GERMANIUM IS DEPOSITED ON THE SECONDLY MENTIONED GERMANIUM CRYSTAL.
Claim 2
Dependent Claim
121 words
A PROCESS FOR MANUFACTURING GERMANIUM CRYSTALS HAVING ZONES OR "LAYERS" OF SEMI-CONDUCTIVITY OF OPPOSITE TYPES, COMPRISING THE FOLLOWING STEPS: INTRODUCING, INTO A BATH CONSISTING OF A MOLTEN SEMI-CONDUCTIVE BODY WHICH HAS A MELTING POINT LOWER THAN THAT OF GERMANIUM AND CRYSTALLISES IN A CUBIC SYSTEM AND HAS A LATTICE DISTANCE OF THE ORDER OF 2.50 ANGSTROMS, A GERMANIUM CRYSTAL OF A GIVEN TYPE OF CONDUCTIVITY, FOR A TIME THAT IS SUFFICIENT FOR IT TO DISSOLVED TO SATURATION IN THE MOLTEN SEMI-CONDUCTIVE BODY AND, WHEN THE SATURATION EQUILIBRIUM HAS BEEN REACHED, INTRODUCING INTO THE SAME BATH A GERMANIUM CRYSTAL OF AN OPOSITE TYPE OF CONDUCTIVITY, THE TEMPERATURE BEING LOWERED SO THAT THE DISSOLVED GERMANIUM IS DEPOSITED ON THE SECONDLY MENTIONED GERMANIUM CRYSTAL.
References Cited (Backward Citations)
US2727939A
Cited
US2689930A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-12 | 1959-12-12 | 1960-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-12 | 1963-12-12 | 1964-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-12 | 1967-12-12 | 1968-06-12 | $7700.00 | Window Closed / Lapsed |