Patent US2736639A successfully refreshed from Google Patents.
US2736639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface treatment of germanium
Assignee: Raytheon Co
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Filing: 1953-12-16
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Granted: 1956-02-28
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Expires: 1973-12-16
Abstract
No abstract record available.
Inventors
- 👤 Jr Ray C Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:18
CPC Classifications
H; H10; H10P; H10P95/00; C; C23; C23F; C23F1/00; H10P50/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
63 words
THE METHOD OF IMPROVING THE ELECTRICAL CHARACTERISTICS OF GERMANIUM BODIES WHICH CONSISTS IN SUBJECTING A GERMANIUM BODY TO A FLUID MIXTURE FROM WHICH EXCESS GERMANIUM IS READILY RECLAIMABLE, SAID MIXTURE BEING COMPRISED OF A POLYBASIC ACID SELECTED FROM THE GROUP CONSISTING OF TARTARIC ACID, CITRIC ACID, AND OXALIC ACID, AND OXIDIZING AGENT, AND WATER, AND THEN WASHING SAID FLUID MIXTURE FROM SAID BODY.
References Cited (Backward Citations)
US2154468A
Cited
US2542727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-02-27 | 1959-08-29 | 1960-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-27 | 1963-08-29 | 1964-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-27 | 1967-08-29 | 1968-02-28 | $7700.00 | Window Closed / Lapsed |