US3624459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolyte composition for wet electrolytic capacitors
Assignee: General Electric Co
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Filing: 1969-12-03
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Granted: 1971-11-30
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Expires: 1989-12-03
Abstract
Abstract The use of surface active agents as inhibitory additives to the electrolyte in wet electrolytic capacitors employing aluminum electrodes is described. Each molecule of the inhibiting amphiphilic substances contains a strongly inhibiting hydrophilic group attached to a hydrophobic group.
Inventors
- 👤 John F Brown Jr
- 👤 Donald R Ochar
- 👤 David A Vermilyea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:36
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/022
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
21 words
The improvement recited in claim 1 wherein the pH of the electrolyte is in the range of from 3.0 to 9.0.
Claim 2
Dependent Claim
16 words
The improvement recited in claim 1 wherein the surface active agent is a dodecyl acid phosphate.
Claim 3
Independent Claim
98 words
A method for providing a protective layer on a metallic aluminum surface comprising the step of immersing said surface in liquid having in solution therein a quantity of surface active agent ranging from an amount effective to cover a finite portion of said surface with a monomolecular layer to about 10 weight percent, said surface active agent having an amphiphilic molecular structure such that individual molecules contain a hydrophobic group and a hydrophilic oxyanion group, the hydrophilic group being selected from the group consisting of phosphate, phosphonate, siliconate, sulfate, sulfonate, arsenate, arsonate, sulfinate, phosphite, phosphinate and carboxylate oxyanions.
Claim 4
Dependent Claim
15 words
The method of claim 4 wherein the surface active agent is a dodecyl acid phosphate.
Claim 5
Dependent Claim
159 words
In the preparation of a wet electrolytic capacitor wherein the following steps are performed: preparing an electrode assembly wherein anode and cathode layers are separated by spacers, said anode layer being made of aluminum foil; impregnating said electrode assembly with a fill electrolyte; ''''aging'''' said electrode assembly by the application of electrical potential thereto; introducing said ''''aged'''' electrode assembly into a can; and capping and sealing said can, the improvement in said series of steps comprising: a. dissolving in the fill electrolyte a quantity of surface active agent ranging from an amount effective to cover a finite portion of the surface of said electrode construction with a monomoLecular layer to about 10 weight percent, saId surface active agent having an amphiphilic molecular structure such that individual molecules contain a hydrophobic group and a hydrophilic oxyanion group, the hydrophilic group being selected from the group consisting of phosphate, phosphonate, siliconate, sulfate, sulfonate, arsenate, arsonate, sulfinate, phosphite, phosphinate, and carboxylate oxyanions.
Claim 6
Dependent Claim
14 words
The method of claim 6 wherein the surface active agent is dodecyl acid phosphate.
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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |