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Patent US2930741A successfully refreshed from Google Patents.
US2930741A
Expired / Lapsed
US
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Electrolytic capacitors
Assignee: —
•
Filing: —
•
Granted: 1960-03-29
•
Expires: 1977-03-29
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:43
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; H01G9/048; H01G9/055; B; B32; B32B; B32B15/00; B32B15/20; C; C25; C25D; C25D11/00; C25D11/02; C25D11/024; C25D11/04; C25F; C25F3/00; C25F3/02; C25F3/04; H01G9/0029; H01G9/0032; H01G9/042; H01G9/045
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A METHOD OF PREPARING A FOIL OF THE GROUP CONSISTING OF ALUMINUM AND ANODICALLY FILM FORMING ALLOYS THEREOF AND SUITABLE FOR USE IN THE MANUFACTURE OF ELECTROLYTIC CAPACITORS, COMPRISING ELECTROLYTICALLY ETCHING ITS SURFACE BY PREPARING AN ELECTROLYTIC ETCHING SOLUTION, DIPPING THE FOIL IN THE SOLUTION, AND APPLYING BETWEEN THE FOIL AND THE ELECTROLYTE A PULSATING DIRECT VOLTAGE TO PRODUCE BETWEEN THE FOIL AND THE ELECTROLYTE A PULSATING BUT UNINTERRUPTED CURRENT HAVING A DEGREE OF PULSATION WITHIN THE RANGE OF 50% TO 250% AND A FREQUENCY OF PULSATION LESS THAN 2,000 CYCLES PER SECOND.
Claim 2
Independent Claim
93 words
A METHOD OF PREPARING A FOIL OF THE GROUP CONSISTING OF ALUMINUM AND ANODICALLY FILM FORMING ALLOYS THEREOF AND SUITABLE FOR USE IN THE MANUFACTURE OF ELECTROLYTIC CAPACITORS, COMPRISING ELECTROLYTICALLY ETCHING ITS SURFACE BY PREPARING AN ELECTROLYTIC ETCHING SOLUTION, DIPPING THE FOIL IN THE SOLUTION, AND APPLYING BETWEEN THE FOIL AND THE ELECTROLYTE A PULSATING DIRECT VOLTAGE TO PRODUCE BETWEEN THE FOIL AND THE ELECTROLYTE A PULSATING BUT UNINTERRUPTED CURRENT HAVING A DEGREE OF PULSATION WITHIN THE RANGE OF 50% TO 250% AND A FREQUENCY OF PULSATION LESS THAN 2,000 CYCLES PER SECOND.
References Cited (Backward Citations)
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-29 | 1963-09-28 | 1964-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-29 | 1967-09-28 | 1968-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-29 | 1971-09-28 | 1972-03-29 | $7700.00 | Window Closed / Lapsed |