US3070522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for electrochemically etching tantalum foil
Assignee: Sprague Electric Co
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Filing: 1957-11-08
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Granted: 1962-12-25
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Expires: 1977-11-08
Abstract
No abstract record available.
Inventors
- 👤 Robinson Preston
- 👤 Donald G Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:27
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: 2
Claim 1
Independent Claim
56 words
A PROCESS FOR ELECTRO-CHEMICALLY ETCHING TANTALUM COMPRISING ANODIC ETCHING OF TANTALUM BY THE ORGANIC ANION OF AN AT LEAST SLIGHTLY ALKALINE SOLUTION CONSISTING OF A SALT OF A FLUORINE SUBSTITUTED ALIPHATIC ACID OF THE GROUP CONSISTING OF ACETIC, BUTYRIC, PROPIONIC, VALERIC AND HEXOIC, IN A SOLVENT POLYHDRIC ALCOHOL, SAID SOLUTION CONTAINING A FEW PERCENT OF MOISTURE.
Claim 2
Dependent Claim
56 words
A PROCESS FOR ELECTRO-CHEMICALLY ETCHING TANTALUM COMPRISING ANODIC ETCHING OF TANTALUM BY THE ORGANIC ANION OF AN AT LEAST SLIGHTLY ALKALINE SOLUTION CONSISTING OF A SALT OF A FLUORINE SUBSTITUTED ALIPHATIC ACID OF THE GROUP CONSISTING OF ACETIC, BUTYRIC, PROPIONIC, VALERIC AND HEXOIC, IN A SOLVENT POLYHDRIC ALCOHOL, SAID SOLUTION CONTAINING A FEW PERCENT OF MOISTURE.
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) | 1965-12-24 | 1966-06-25 | 1966-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-24 | 1970-06-25 | 1970-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-24 | 1974-06-25 | 1974-12-25 | $7700.00 | Window Closed / Lapsed |