Patent US5369596A successfully refreshed from Google Patents.
US3668089A
Expired / Lapsed
US
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Tin oxide etching method
Assignee: AT&T Inc
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Filing: 1969-11-10
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Granted: 1972-06-06
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Expires: 1989-11-10
Abstract
Abstract Tin oxide (SnO2) is etched by forming a layer of a metal such as aluminum on the portions of the SnO2 surface to be etched, and then contacting the metal with an aqueous solution of hydrochloric acid. Passage of a current through the tin oxidemetal composite as cathode while in contact with the solution as electrolyte may be employed to speed up removal of SnO2.
Inventors
- 👤 Eugene W Chase
- 👤 Harold J Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:51
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/26; H05B33/28; C; C03; C03C; C03C23/00; H01; H01B; H01B1/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
12 words
The method of claim 1 in which the metallic layer comprises aluminum.
Claim 2
Dependent Claim
24 words
The method of claim 2 in which the acid is hydrochloric and is present in an amount from 10 to 20 percent by volume.
Claim 3
Dependent Claim
24 words
The method of claim 1 in which current is passed through the composite as a cathode while in contact with the solution as electrolyte.
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |