US2742416A
Expired / Lapsed
US
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Method of etching tantalum
Assignee: General Electric Co
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Filing: 1952-12-17
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Granted: 1956-04-17
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Expires: 1972-12-17
Abstract
No abstract record available.
Inventors
- 👤 Alfred L Jenny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:43
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; H01G9/048; H01G9/055; C; C25; C25F; C25F3/00; C25F3/02; C25F3/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
53 words
THE METHOD OF ELECTROLYTICALLY ETCHING TANTALUM WHICH COMPRISES MAKING THE TANTALUM THE ANODE IN AN ELECTROLYTE SOLUTION CONSISTING OF FORMAMIDE, DIMETHYL FORMAMIDE, FROM 9,500 TO 11,500 PARTS PER MILLION BY WEIGHT OF WATER, AND SUFFICIENT OF AMMONIUM BIFLUORIDE DISSOLVED THEREIN TO PROVIDE A SOLUTION HAVING A CONDUCTIVITY CAPABLE OF PASSING A CURRENT THERETHROUGH.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-17 | 1959-10-17 | 1960-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-17 | 1963-10-17 | 1964-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-17 | 1967-10-17 | 1968-04-17 | $7700.00 | Window Closed / Lapsed |