US3087872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic capacitor and method for producing same
Assignee: Sprague Electric Co
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Filing: 1960-09-15
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Granted: 1963-04-30
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Expires: 1980-09-15
Abstract
No abstract record available.
Inventors
- 👤 Walter J Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:45
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/0029; H01G9/0032; C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A METHOD OF ANODICALLY PRODUCING AN ALUMINUM OXIDE DIELECTRIC FILM ADHERING TO AN ALUMINUM ELECTRODE COMPRISING THE SEPTS OF FIRSTLY FORMING A POROUS SUBSTANTIALLY NON-HYDRATED ADHERENT FILM OF ALUMINA ON SAID ELECTRODE BY MAKING THE LATTER THE ANODE IN A BATH OF MOLTEN SALT, SAID SALT BEING SELECTED FROM THE CLASS OF LOW MELTING ACID SULFATES CONSISTING OF AMMONIUM BISULFATE AND POTASSIUM BISULFATE, AND SECONDLY FORMING A DENSE NONPOROUS OXIDE FILM IN THE INTERSTICES OF SAID POROUS FILM BY MAKING THE SULFACE-OXIDIZED ELECTRODE THE ANODE IN A BARRIER TYPE ELECTROLYTE.
Claim 2
Independent Claim
90 words
A METHOD OF ANODICALLY PRODUCING AN ALUMINUM OXIDE DIELECTRIC FILM ADHERING TO AN ALUMINUM ELECTRODE COMPRISING THE SEPTS OF FIRSTLY FORMING A POROUS SUBSTANTIALLY NON-HYDRATED ADHERENT FILM OF ALUMINA ON SAID ELECTRODE BY MAKING THE LATTER THE ANODE IN A BATH OF MOLTEN SALT, SAID SALT BEING SELECTED FROM THE CLASS OF LOW MELTING ACID SULFATES CONSISTING OF AMMONIUM BISULFATE AND POTASSIUM BISULFATE, AND SECONDLY FORMING A DENSE NONPOROUS OXIDE FILM IN THE INTERSTICES OF SAID POROUS FILM BY MAKING THE SULFACE-OXIDIZED ELECTRODE THE ANODE IN A BARRIER TYPE ELECTROLYTE.
References Cited (Backward Citations)
GB397538A
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GB509915A
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GB644887A
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US2666023A
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US3002900A
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US2907933A
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US2905600A
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US2930951A
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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) | 1966-04-29 | 1966-10-29 | 1967-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-29 | 1970-10-29 | 1971-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-29 | 1974-10-29 | 1975-04-30 | $7700.00 | Window Closed / Lapsed |