US2941875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of etching a germanium surface
Assignee: Sony Corp
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Filing: 1957-08-14
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Granted: 1960-06-21
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Expires: 1977-08-14
Abstract
No abstract record available.
Inventors
- 👤 Amaya Akio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:51
CPC Classifications
C; C23; C23F; C23F3/00; C23F3/04; H; H10; H10P; H10P95/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
68 words
A METHOD OF ETCHING A GERMANIUM SURFACE, WHICH COMPRISES THE STEPS OF LOCATING A GERMANIUM ELEMENT IN AN AQUEOUS SOLUTION CONSISTING ESSENTIALLY OF 0.01% TO 5% BY WEIGHT OF SODIUM HYPROCHLORITE, WHILE SAID ELEMENT IS LOCATED IN SAID SOLUTION BUBBLING INTO THE SOLUTION CARBON DIOXIDE TO PROVIDE A PH OF ABOUT 6.5-6.6, AND MAINTAINING THE ELEMENT IN THE SOLUTION UNTIL A MIRRORLIKE FINISH IS OBTAINED ON THE ELEMENT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-21 | 1963-12-21 | 1964-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-21 | 1967-12-21 | 1968-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-21 | 1971-12-21 | 1972-06-21 | $7700.00 | Window Closed / Lapsed |