US2576267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of germanium rectifier material
Assignee: AT&T Inc
•
Filing: 1948-10-27
•
Granted: 1951-11-27
•
Expires: 1968-10-27
Abstract
No abstract record available.
Inventors
- 👤 Jack H Scaff
- 👤 Henry C Theuerer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:59
CPC Classifications
H; H10; H10P; H10P95/00; C; C01; C01B; C01B33/00; C01B33/02; C22; C22B; C22B41/00; H10P14/00; H10P14/20; H10P14/26; H10P14/263; H10P14/34; H10P14/3402; H10P14/3404; H10P14/3411
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
A METHOD OF PREPARING HERMANIUM MATERIAL FOR USE IN CONDUCTIVE DEVICES THAT COMPRISES HEATING GERMANIUM OXIDE MATERIAL IN A GRAPHIC CONTAINER IN THE PRESENCE OF A REDUCING ATMOSPHERE TO OBTAIN GERMANIUM MATERIAL, MELTING THE RESULTING MATERIAL IN A GRAPHITE CONTAINER, COOLING THE MELT TO PROGRESSIVELY SOLIDFY IT FROM ONE EXTREMITY TO THE OTHER, AND DIVIDING THE SOLIDIFIED MATERIAL INTO CIRCUIT ELEMENTS,
Claim 2
Independent Claim
63 words
THE METHOD OF PREPARING GERMANIUM MATERIAL FOR USE IN CONDUCTIVE DEVICES WHICH COMPRISES MELTING A QUANTITY OF GERMANIUM MATERIAL, PROGRESSIVELY COOLING THE MELT ALONG AN AXIS, WHEREBY THE IMPURITIES PRESENT ARE OF GREATER CONCENTRATION IN THE LAST FROZEN PORTION OF THE RESULTING INGOT, REMOVING SOME OF THE INGOT, PORTION, REMELTING THE REMAINDER OF THE INGOT, AND PROGRESSIVELY COOLING IT TO REDISTRIBUTE THE IMPURITIES.
References Cited (Backward Citations)
US1812172A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-26 | 1955-05-28 | 1955-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-26 | 1959-05-28 | 1959-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-26 | 1963-05-28 | 1963-11-27 | $7700.00 | Window Closed / Lapsed |