US3732470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic device and semiconductor oxide electrolyte therefore
Assignee: Individual
•
Filing: 1971-12-20
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Granted: 1973-05-08
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Expires: 1991-12-20
Abstract
Abstract A solid electrolytic capacitor is produced by competing electrolytic reactions that produce a dielectric film on the surfaces of a porous anode and a layer of semiconductive oxides on the dielectric film. Current is passed through the anode and a suitable cathode in an aqueous electrolyte containing a filmforming anion and cation capable of being oxidized to a semiconductive layer on the surface of the dielectric film. The thickness of the semiconductive layer is controlled by an intermediate step of depositing a given amount of a hydroxide of the cation on the dielectric film by reversing the current between the initial and final oxidation.
Inventors
- 👤 P Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:12
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/15
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
65 words
The device of claim 1 wherein said porous pellet is a member of the group consisting of aluminum, tantalum and niobium; said film forming anion is a member of the group consisting of phosphate, borate, persulfate, urate, trimellitate, pyromellitate, terephthalate, isophthalate, perchlorate and sulfamate; and said semiconductive oxide forming cation is a member of the group consisting of Mn, Ni, Ag, Pb, and mixtures thereof.
Claim 2
Independent Claim
113 words
A method of making an electrolytic device having a film-forming metal coated with a dielectric film and a superimposed semiconductiVe layer comprising the steps of producing a porous pellet of a film-forming metal, anodizing said porous pellet in an electrolyte containing both a film forming anion and a semiconductive oxide forming cation to produce said dielectric film, cathodically depositing the hydroxide of said cation in and on said porous pellet, continuing anodization in said electrolyte to produce said semiconducting oxide layer in intimate contact with said dielectric film, continuing anodization in said electrolyte still further to produce additional dielectric film, and making connections to said porous pellet and to said semiconducting oxide layer.
Claim 3
Dependent Claim
15 words
The method of claim 3 where a cation of a strong alkali is also present.
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) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |