US4434084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Base metal conductor cathode coating for tantalum capacitors
Assignee: EIDP Inc
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Filing: 1981-09-23
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Granted: 1984-02-28
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Expires: 2001-09-23
Abstract
Abstract Cathodic coating for tantalum capacitors containing (a) a mixture of finely divided copper and tin or tin alloy particles dispersed in a solution of (b) organic acid flux, and (c) organic amine in (d) inert organic medium.
Inventors
- 👤 William T. Hicks
- 👤 William C. Seidel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:34
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; H01G9/042; H01G9/0425
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
138 words
A metallizing composition for use as a capacitor cathode coating comprising (a) 92-97% by weight of a mixture of 70-95% weight finely divided particles of copper and 30-35% wt. finely divided particles of tin-containing metal, dispersed in a solution of (b) 4-1.5% by wt. of an organic acid flux having an acid number of at least 100 and which is thermally stable to a temperature of at least 230° C., and (c) 4-1.5% by wt. of an organic amine corresponding to the formula ##STR3## wherein R is independently selected from the group consisting of H, C 1-8 alkyl, C 2-4 alkenyl and C 1-4 hydroxy alkyl, at least one of the R groups being alkyl or hydroxyalkyl in (d) an inert organic medium the total amount of resin in the composition being no greater than 4% by wt.
Claim 2
Dependent Claim
138 words
A metallizing composition for use as a capacitor cathode coating comprising (a) 92-97% by weight of a mixture of 70-95% weight finely divided particles of copper and 30-35% wt. finely divided particles of tin-containing metal, dispersed in a solution of (b) 4-1.5% by wt. of an organic acid flux having an acid number of at least 100 and which is thermally stable to a temperature of at least 230° C., and (c) 4-1.5% by wt. of an organic amine corresponding to the formula ##STR3## wherein R is independently selected from the group consisting of H, C 1-8 alkyl, C 2-4 alkenyl and C 1-4 hydroxy alkyl, at least one of the R groups being alkyl or hydroxyalkyl in (d) an inert organic medium the total amount of resin in the composition being no greater than 4% by wt.
Claim 3
Dependent Claim
13 words
The composition of claim 1 in which the organic acid flux is rosin-derived.
Claim 4
Dependent Claim
17 words
The composition of claim 2 in which the organic acid flux is hydrogenated or nonhydrogenated abietic acid.
Claim 5
Dependent Claim
19 words
The composition of claim 1 in which the organic acid is a saturated or unsaturated long chain fatty acid.
Claim 6
Dependent Claim
13 words
The composition of claim 1 in which the organic amine is a polyalkanolamine.
Claim 7
Dependent Claim
12 words
The composition of claim 5 in which the polyalkanolamine is triethanol amine.
Claim 8
Dependent Claim
23 words
The composition of any of claims 1-6 which contains 75-90% wt. copper, 25-10% wt. tin, 2.5-3.5% organic acid flux and 2.5-3.5% organic amine.
References Cited (Backward Citations)
US4054714A
Cited
US4353816A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-27 | 1987-08-29 | 1988-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-27 | 1991-08-29 | 1992-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-27 | 1995-08-29 | 1996-02-28 | $7700.00 | Window Closed / Lapsed |