Patent US3415722A successfully refreshed from Google Patents.
US3415722A
Expired / Lapsed
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Method of forming capacitor electrodes
Assignee: BASF Schweiz AG
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Filing: 1966-03-10
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Granted: 1968-12-10
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Expires: 1986-03-10
Abstract
No abstract record available.
Inventors
- 👤 Walter Scheller
- 👤 George Korinek
- 👤 Gustav Daendliker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:31
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/0029; H01G9/0032
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
75 words
A PROCESS FOR FORMING AN ELECTROLYTIC CAPACITOR ELECTRODE FROM SINTERED VALVE METAL PELLETS SELECTED FROM THE GROUP CONSISTING OF TITANIUM, ZIRCONIUM, TANTALUM AND NIOBIUM, WHICH COMPRISES SUBJECTING THE INNER AND THE OUTER SURFACE OF A POROUS BODY OF THE SINTERED METAL PELLETS TO ANODIC OXIDATION IN AN ELECTROLYTE, THE OXIDE LAYER ON THE OUTER SURFACE OF THE POROUS BODY BEING FORMED AT A HIGHER VOLTAGE THAN THAT ON THE INNER SURFACE OF THE POROUS BODY.
Claim 2
Dependent Claim
75 words
A PROCESS FOR FORMING AN ELECTROLYTIC CAPACITOR ELECTRODE FROM SINTERED VALVE METAL PELLETS SELECTED FROM THE GROUP CONSISTING OF TITANIUM, ZIRCONIUM, TANTALUM AND NIOBIUM, WHICH COMPRISES SUBJECTING THE INNER AND THE OUTER SURFACE OF A POROUS BODY OF THE SINTERED METAL PELLETS TO ANODIC OXIDATION IN AN ELECTROLYTE, THE OXIDE LAYER ON THE OUTER SURFACE OF THE POROUS BODY BEING FORMED AT A HIGHER VOLTAGE THAN THAT ON THE INNER SURFACE OF THE POROUS BODY.
Claim 3
Dependent Claim
65 words
A PROCESS ACCORDING TO CLAIM 1, WHICH COMPRISES A FIRST STAGE PRE-FORMING THE PELLETS BY ANODIZATION, THEN IMPREGNATING SAID PELLETS WITH A SUBSTANCE THAT IS INSOLUBLE IN THE ELECTROLYTE WHEREBY SAID INNER AND OUTER AURFACES ARE COATED, EXTRACTING THE SUPERFICIAL IMPREGNATION, WHEREBY SAID INNER SURFACE REMAINS COATED, POST-FORMING BY ANODIZATION THE PELLETS AGAINST THE HIGHER VOLTAGE AND REMOVING THE IMPREGNATION THEN COMPLETELY BY SOLVENT EXTRACTION.
References Cited (Backward Citations)
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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) | 1971-12-10 | 1972-06-10 | 1972-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-10 | 1976-06-10 | 1976-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-10 | 1980-06-10 | 1980-12-10 | $7700.00 | Window Closed / Lapsed |