US2808542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foil for electrolytic condensers and process
Assignee: General Electric Co
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Filing: 1953-12-28
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Granted: 1957-10-01
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Expires: 1973-12-28
Abstract
No abstract record available.
Inventors
- 👤 David A Vermilyea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:29
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; C; C23; C23G; C23G1/00; C23G1/02; C23G1/10; C23G1/106
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A PROCESS FOR PRODUCING A SMOOTH SURFACE ON TANTALUM FOIL FOR USE IN ELECTROLYTIC CAPACITORS COMPRISING THE STEPS OF SUBJECTING THE ROUGH SURFACE OF AS-ROLLED FOIL TO A SOLUTION CONSISTING ESSENTIALLY OF 5 PARTS BY VOLUME SULFURIC ACID, 2 PARTS BY VOLUME NITRIC ACID AND 1.5 PARTS BY VOLUME HYDEOFLORIC ACID FOR FROM 2 TO 10 SECONDS AND THEN REMOVING THE ACID SOLUTION BY WASHING, WHEREBY SHARPLY CONTOURED MICROSCOPIC SURFACE IRREGULARITIES ARE REMOVED WITHOUT ETCHING THE SURFACE.
Claim 2
Dependent Claim
77 words
A PROCESS FOR PRODUCING A SMOOTH SURFACE ON TANTALUM FOIL FOR USE IN ELECTROLYTIC CAPACITORS COMPRISING THE STEPS OF SUBJECTING THE ROUGH SURFACE OF AS-ROLLED FOIL TO A SOLUTION CONSISTING ESSENTIALLY OF 5 PARTS BY VOLUME SULFURIC ACID, 2 PARTS BY VOLUME NITRIC ACID AND 1.5 PARTS BY VOLUME HYDEOFLORIC ACID FOR FROM 2 TO 10 SECONDS AND THEN REMOVING THE ACID SOLUTION BY WASHING, WHEREBY SHARPLY CONTOURED MICROSCOPIC SURFACE IRREGULARITIES ARE REMOVED WITHOUT ETCHING THE 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) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |