US2739882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface treatment of germanium
Assignee: Raytheon Co
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Filing: 1954-02-25
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Granted: 1956-03-27
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Expires: 1974-02-25
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 06:04
CPC Classifications
C; C23; C23F; C23F1/00; C09; C09G; C09G1/00; H; H10; H10P; H10P95/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
85 words
THE METHOD OF IMPROVING THE ELECTRICAL CHARACTERISTICS OF A GERMANIUM BODY COMPRISING ETCHING THE SURFACE OF SAID BODY WITH A SOLUTION FROM WHICH EXCESS GERMANIUM IS READILY RECLAIMABLE, SAID SOLUTION COMPRISING A FLUID MIXTURE COMPRISING A SEQUENTLY AGENT SELECTED FROM THE GROUP CONSISTING OF ETHYLENEDIAMINE TETRA-ACETIC ACID, THE TETRA-SODIUM SALT OF SAID ACID, THE TRI-SODIUM SALT OF SAID ACID, THE DI-SODIUM SALT OF SAID ACID AND THE MONO-SODIUM SALT OF SAID ACID, AND COMPATIBLE OXIDIZING AGENT, AND THEN WASHING SAID FLUID MIXURE FROM SAID SURFACE.
References Cited (Backward Citations)
US2577803A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |