US4522737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytes for electrolytic capacitors
Assignee: CORNELL-DUBIILIER MARKETING Inc
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Filing: 1983-08-08
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Granted: 1985-06-11
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Expires: 2003-08-08
Abstract
Abstract An electrolyte for electrolytic capacitors comprises an alkyl glycol of 2 to 4 carbons; ammonium formate; and either a dicarboxylic acid of 2 to 8 carbons or its diammonium salt, wherein the ammonium ion is of the formula NH--(R) 3 in which R is H, or alkyl or alkanol of 1 to 7 carbons.
Inventors
- 👤 Richard W. MacNamee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:45
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/022
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
74 words
An electrolyte for an electrolytic capacitor, comprising: about 2 to 20 weight percent of ammonium formate; about 1 to 12 weight percent of a dicarboxylic acid of 2 to 8 carbons or its diammonium salt, wherein the ammonium ion is of the formula NH--(R) 3 in which R is H, alkyl of 1 to 7 carbons or alkanol of 1 to 7 carbons; the balance being an alkyl glycol of 2 to 4 carbons.
Claim 2
Dependent Claim
74 words
An electrolyte for an electrolytic capacitor, comprising: about 2 to 20 weight percent of ammonium formate; about 1 to 12 weight percent of a dicarboxylic acid of 2 to 8 carbons or its diammonium salt, wherein the ammonium ion is of the formula NH--(R) 3 in which R is H, alkyl of 1 to 7 carbons or alkanol of 1 to 7 carbons; the balance being an alkyl glycol of 2 to 4 carbons.
Claim 3
Dependent Claim
31 words
The electrolyte of claim 1, wherein said ammonium formate constitutes about 2 to 20 weight percent, and said dicarboxylic acid or its diammonium salt constitutes about 1 to 12 weight percent.
Claim 4
Dependent Claim
35 words
The electrolyte of claim 2, wherein said ammonium formate constitutes about 2 to 8 weight percent, said diammonium carboxylic acid salt constitutes about 5 to 12 weight percent, and said alkyl glycol is ethylene glycol.
Claim 5
Dependent Claim
14 words
The electrolyte of claim 3, wherein said diammonium carboxylic acid salt is diammonium adipate.
Claim 6
Dependent Claim
33 words
The electrolyte of claim 2, wherein said ammonium formate constitutes about 15 to 20 weight percent, said dicarboxylic acid constitutes about 1 to 5 weight percent, and said alkyl glycol is ethylene glycol.
Claim 7
Dependent Claim
12 words
The electrolyte of claim 5, wherein said dicarboxylic acid is maleic acid.
Claim 8
Dependent Claim
14 words
The electrolyte of claim 1, wherein at least one of R is not H.
Claim 9
Dependent Claim
80 words
An electrolyte for an electrolytic capacitor consisting essentially of about 2 to 8 weight percent of ammonium formate, about 5 to 12 weight percent of a diammonium carboxylic acid salt of 2 to 8 carbons wherein the ammonium ion is of the formula NH--(R) 3 in which R is H, alkyl of 1 to 7 carbons, or alkanol of 1 to 7 carbons, and the balance of ethylene glycol, with a maximum electrolyte content of about 0.3 weight percent water.
Claim 10
Dependent Claim
80 words
An electrolyte for an electrolytic capacitor consisting essentially of about 2 to 8 weight percent of ammonium formate, about 5 to 12 weight percent of a diammonium carboxylic acid salt of 2 to 8 carbons wherein the ammonium ion is of the formula NH--(R) 3 in which R is H, alkyl of 1 to 7 carbons, or alkanol of 1 to 7 carbons, and the balance of ethylene glycol, with a maximum electrolyte content of about 0.3 weight percent water.
Claim 11
Dependent Claim
28 words
The electrolyte of claim 8, wherein said ammonium formate constitutes about 4 weight percent, and said diammonium carboxylic acid salt constitutes about 9 weight percent of diammonium adipate.
Claim 12
Dependent Claim
51 words
An electrolyte for an electrolytic capacitor consisting essentially of about 15 to 20 weight percent of ammonium formate, about 1 to 5 weight percent of a dicarboxylic acid of 2 to 8 carbon atoms, and the balance of ethylene glycol, with a maximum electrolytic content of about 0.3 weight percent water.
Claim 13
Dependent Claim
51 words
An electrolyte for an electrolytic capacitor consisting essentially of about 15 to 20 weight percent of ammonium formate, about 1 to 5 weight percent of a dicarboxylic acid of 2 to 8 carbon atoms, and the balance of ethylene glycol, with a maximum electrolytic content of about 0.3 weight percent water.
Claim 14
Dependent Claim
26 words
The electrolyte of claim 10, wherein said ammonium formate constitutes about 20 weight percent, and said dicarboxylic acid constitutes about 1 weight percent of maleic acid.
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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) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |