US2755237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytically etched condenser electrode
Assignee: Sprague Electric Co
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Filing: 1951-07-25
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Granted: 1956-07-17
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Expires: 1971-07-25
Abstract
No abstract record available.
Inventors
- 👤 Terry E Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:00
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; C; C25; C25F; C25F3/00; C25F3/02; C25F3/04; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/934; Y10T; Y10T428/00; Y10T428/12; Y10T428/12431; Y10T428/12465; Y10T428/12993; Y10T428/24; Y10T428/24355
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
92 words
THE PROCESS OF ELECTRO-ETCHING ALUMINUM FOIL SO AS TO OBTAIN A GREATER EFFECTIVE SURFACE AREA THAN THE MARGINAL DIMENSIONS OF THE SURFACE WHICH PROCESS COMPRISES HEATING AN ALUMINUM FOIL HAVING A PURITY OF AT LEAST 99.88% AT A TEMPERATURE OF FROM 500* C. TO JUST BELOW ITS MELTING POINT OF FROM 15 MINUTES TO 24 HOURS TO ORIENT THE 200 PLANES OF THE METAL CRYSTALS PARALLEL TO THE FOIL SURFACE, AND AFTER LESS THAN 2 HOURS EXPOSURE TO LOWER TEMPERATURES, ELECTROLUTICALLY ETCHING SAID TREATED FOIL IN AN AQUEOUS SOLUTION OF A HALIDE.
Claim 2
Dependent Claim
92 words
THE PROCESS OF ELECTRO-ETCHING ALUMINUM FOIL SO AS TO OBTAIN A GREATER EFFECTIVE SURFACE AREA THAN THE MARGINAL DIMENSIONS OF THE SURFACE WHICH PROCESS COMPRISES HEATING AN ALUMINUM FOIL HAVING A PURITY OF AT LEAST 99.88% AT A TEMPERATURE OF FROM 500* C. TO JUST BELOW ITS MELTING POINT OF FROM 15 MINUTES TO 24 HOURS TO ORIENT THE 200 PLANES OF THE METAL CRYSTALS PARALLEL TO THE FOIL SURFACE, AND AFTER LESS THAN 2 HOURS EXPOSURE TO LOWER TEMPERATURES, ELECTROLUTICALLY ETCHING SAID TREATED FOIL IN AN AQUEOUS SOLUTION OF A HALIDE.
Claim 3
Dependent Claim
63 words
AN ELECTROLYTIC CONDENSER ELECTRODE COMPRISING AN ETCHED FOIL OF ALUMINUM HAVING A PURITY OF AT LEAST 99.88% THE 200 PLANES OF THE ALUMINUM CRYSTALS IN SAID FOIL BEING PARALLEL TO THE FOIL SURFACE, THE ETCHED ALUMINUM SURFACE HAVING DEEP INDENTATIONS WITH CUBE-LIKE COLUMNS OF ALUMINUM THE FOIL BEING FORMED AND HAVING AN ETCH RATIO GREATER THAN ABOUT 7.5 WHEN FORMED AT 600 VOLTS.
Claim 4
Dependent Claim
63 words
AN ELECTROLYTIC CONDENSER ELECTRODE COMPRISING AN ETCHED FOIL OF ALUMINUM HAVING A PURITY OF AT LEAST 99.88% THE 200 PLANES OF THE ALUMINUM CRYSTALS IN SAID FOIL BEING PARALLEL TO THE FOIL SURFACE, THE ETCHED ALUMINUM SURFACE HAVING DEEP INDENTATIONS WITH CUBE-LIKE COLUMNS OF ALUMINUM THE FOIL BEING FORMED AND HAVING AN ETCH RATIO GREATER THAN ABOUT 7.5 WHEN FORMED AT 600 VOLTS.
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) | 1959-07-17 | 1960-01-16 | 1960-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-17 | 1964-01-16 | 1964-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-17 | 1968-01-16 | 1968-07-17 | $7700.00 | Window Closed / Lapsed |