US2704708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the preparation of germanium
Assignee: Compagnie des Freins et Signaux Westinghouse SA
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Filing: 1949-08-11
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Granted: 1955-03-22
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Expires: 1969-08-11
Abstract
No abstract record available.
Inventors
- 👤 Welker Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:13
CPC Classifications
B; B28; B28D; B28D1/00; C; C30; C30B; C30B29/00; C30B29/02; C30B29/08; C30B9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
IN A METHOD OF PREPARING GERMANIUM, THE STEPS OF HEATING THE GERMANIUM TO A TEMPERATURE SUBSTANTIALLY ABOVE THE POINT OF SOLIDIFICATION TO CAUSE IT TO BE LIQUID, SO SLOWLY COOLING DOWN SAID GERMANIUM FROM SAID TEMPERATURE SUBSTANTIALLY ABOVE THE SOLIDIFICATION POINT THAT IT IS MAINTAINED IN ITS LIQUID STATE AT A TEMPERATURE SUBSTANTIALLY BELOW THE SOLIDIFICATION POINT, AND PASSING A SUBSTANTIALLY NEUTRAL GASEOUS FLOW THROUGH SAID GERMANIUM WHILE IT IS MAINTAINED IN SAID LIQUID STATE.
Claim 2
Dependent Claim
75 words
IN A METHOD OF PREPARING GERMANIUM, THE STEPS OF HEATING THE GERMANIUM TO A TEMPERATURE SUBSTANTIALLY ABOVE THE POINT OF SOLIDIFICATION TO CAUSE IT TO BE LIQUID, SO SLOWLY COOLING DOWN SAID GERMANIUM FROM SAID TEMPERATURE SUBSTANTIALLY ABOVE THE SOLIDIFICATION POINT THAT IT IS MAINTAINED IN ITS LIQUID STATE AT A TEMPERATURE SUBSTANTIALLY BELOW THE SOLIDIFICATION POINT, AND PASSING A SUBSTANTIALLY NEUTRAL GASEOUS FLOW THROUGH SAID GERMANIUM WHILE IT IS MAINTAINED IN SAID LIQUID STATE.
References Cited (Backward Citations)
US2261516A
Cited
US2270660A
Cited
US2390052A
Cited
US2514879A
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GB632942A
Cited
US2505633A
Cited
US2504628A
Cited
US2447829A
Cited
US2474701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-03-21 | 1958-09-20 | 1959-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-03-21 | 1962-09-20 | 1963-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-03-21 | 1966-09-20 | 1967-03-22 | $7700.00 | Window Closed / Lapsed |