US2705192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Etching solutions and process for etching members therewith
Assignee: Westinghouse Electric Corp
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Filing: 1954-06-04
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Granted: 1955-03-29
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Expires: 1974-06-04
Abstract
No abstract record available.
Inventors
- 👤 Jr John W Faust
- 👤 Jr Richard H Wynne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:58
CPC Classifications
H; H10; H10P; H10P50/00; H10P50/60; H10P50/64; H10P50/642; C; C03; C03C; C03C15/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
IN THE METHOD OF TREATING A SURFACE OF A SEMICONDUCTING MATERIAL SELECTED FROM THE GROUP CONSISTING OF SILICON AND GERMANIUM, THE STEPS COMPRISING ETCHING SAID SURFACE IN AN AQUEOUS SOLUTION OF HYDROFLUORIC ACID, NITRIC ACID, AND MERCURIC NITRATE, AND THEN RINSING SAID ETCHING SOLUTION FROM SAID SURFACE.
Claim 2
Dependent Claim
47 words
IN THE METHOD OF TREATING A SURFACE OF A SEMICONDUCTING MATERIAL SELECTED FROM THE GROUP CONSISTING OF SILICON AND GERMANIUM, THE STEPS COMPRISING ETCHING SAID SURFACE IN AN AQUEOUS SOLUTION OF HYDROFLUORIC ACID, NITRIC ACID, AND MERCURIC NITRATE, AND THEN RINSING SAID ETCHING SOLUTION FROM SAID SURFACE.
References Cited (Backward Citations)
US2600997A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-03-28 | 1958-09-27 | 1959-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-03-28 | 1962-09-27 | 1963-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-03-28 | 1966-09-27 | 1967-03-29 | $7700.00 | Window Closed / Lapsed |