US4101458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolyte for electrolytic capacitors
Assignee: Sanyo Electric Co Ltd
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Filing: 1976-12-21
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Granted: 1978-07-18
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Expires: 1996-12-21
Abstract
Abstract An electrolyte for electrolytic capacitors comprising N-ethylformamide or its mixture with any other solvent containing at least about 10% by weight of N-ethylformamide and an acid salt of maleic acid with ammonia or an amine. The electrolyte can be used in electrolytic capacitors designed to operate in a temperature range of about -65° to 100° C.
Inventors
- 👤 Yutaka Taketani
- 👤 Shinichi Niwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:42
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/022
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
81 words
An electrolyte for electrolytic capacitors consisting essentially of a solvent, a solute dissolved therein, and an amount of water sufficient to form a dielectric layer on a capacitor anode, wherein said solvent consists essentially of an amide solvent containing at least 10% by weight of N-ethylformamide and said solute is an acid salt of maleic acid with ammonia or an amine, the amide solvent other than N-ethylformamide when present being selected from the group consisting of N-methylformamide, dimethylformamide, diethylformamide and dimethylacetamide.
Claim 2
Dependent Claim
81 words
An electrolyte for electrolytic capacitors consisting essentially of a solvent, a solute dissolved therein, and an amount of water sufficient to form a dielectric layer on a capacitor anode, wherein said solvent consists essentially of an amide solvent containing at least 10% by weight of N-ethylformamide and said solute is an acid salt of maleic acid with ammonia or an amine, the amide solvent other than N-ethylformamide when present being selected from the group consisting of N-methylformamide, dimethylformamide, diethylformamide and dimethylacetamide.
Claim 3
Dependent Claim
12 words
The electrolyte of claim 1, wherein the solute is acid triethylammonium maleate.
Claim 4
Dependent Claim
35 words
The electrolyte of claim 1, wherein the comcentration of the solute therein is at least about 1% by weight but not exceeding the one corresponding to a saturated solution of the solute in the solvent.
Claim 5
Dependent Claim
20 words
The electrolyte of claim 3, wherein the concentration of the solute therein is from about 5 to 30% by weight.
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) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |