US2542727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Etching processes and solutions
Assignee: AT&T Inc
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Filing: 1949-12-29
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Granted: 1951-02-20
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Expires: 1969-12-29
Abstract
No abstract record available.
Inventors
- 👤 Henry C Theuerer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:33
CPC Classifications
H; H10; H10P; H10P95/00; C; C09; C09K; C09K13/00; C09K13/04; C09K13/08; H10P50/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
THE PROCESS OF PREPARING THE SURFACE OF A BODY OF GERMANIUM FOR USE IN A SEMICONDUCTOR TRANSLATOR WHICH COMPRISES ETCHING SAID SURFACE IN AN AQUEOUS SOLUTION OF HYDROGEN PEROXIDE AND HYDROGEN FLUORIDE AND THEN WASHING SAID ETCHING FLUID FROM SAID SURFACE.
Claim 2
Dependent Claim
41 words
THE PROCESS OF PREPARING THE SURFACE OF A BODY OF GERMANIUM FOR USE IN A SEMICONDUCTOR TRANSLATOR WHICH COMPRISES ETCHING SAID SURFACE IN AN AQUEOUS SOLUTION OF HYDROGEN PEROXIDE AND HYDROGEN FLUORIDE AND THEN WASHING SAID ETCHING FLUID FROM SAID SURFACE.
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) | 1954-02-19 | 1954-08-21 | 1955-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-19 | 1958-08-21 | 1959-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-19 | 1962-08-21 | 1963-02-20 | $7700.00 | Window Closed / Lapsed |