US4117531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic capacitor
Assignee: UNITED CHEMI-CON MANUFACTURING Inc
•
Filing: 1977-05-25
•
Granted: 1978-09-26
•
Expires: 1997-05-25
Abstract
Abstract An electrolyte system for electrolytic capacitors contains as solute an ammonium or amine salt of an amic acid or an amate. These salts may be obtained by the reaction of maleic, succinic, phthalic, or hexahydrophthalic anhydride with ammonia or an amine.
Inventors
- 👤 Sidney D. Ross
- 👤 Franz S. Dunkl
- 👤 Manuel Finkelstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:48
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/022
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
81 words
An electrolytic capacitor comprising a capacitance section having a plurality of electrodes, at least one being a valve-metal electrode having a dielectric layer on its surface, said section being impregnated with an electrolyte comprising a solvent selected from the group consisting of dimethylformamide, N-methylformamide, glycol, and glycol-methylcellosolve, and a solute consisting essentially of a compound selected from the group consisting of ammonium or amine salts of an amic acid selected from the group consisting of maleamic, succinamic, phthalamic, and hexahydrophthalamic acids.
Claim 2
Dependent Claim
81 words
An electrolytic capacitor comprising a capacitance section having a plurality of electrodes, at least one being a valve-metal electrode having a dielectric layer on its surface, said section being impregnated with an electrolyte comprising a solvent selected from the group consisting of dimethylformamide, N-methylformamide, glycol, and glycol-methylcellosolve, and a solute consisting essentially of a compound selected from the group consisting of ammonium or amine salts of an amic acid selected from the group consisting of maleamic, succinamic, phthalamic, and hexahydrophthalamic acids.
Claim 3
Dependent Claim
53 words
An electrolytic capacitor as claimed in claim 1 wherein said amine has the formula R 1 R 2 R 3 N in which R 1 , R 2 , and R 3 are selected from the group consisting of hydrogen, alkyl, aryl, and cycloalkyl groups or together with N form a heterocyclic group.
Claim 4
Dependent Claim
28 words
An electrolytic capacitor as claimed in claim 1 where said electrolyte has a resistivity within the range of about 139 to about 922 Ω -cm at 25° C.
Claim 5
Dependent Claim
35 words
An electrolytic capacitor as claimed in claim 2 wherein R 1 R 2 R 3 N is selected from the group consisting of ammonia, piperidine, aniline, benzylamine, morpholine, methylamine, dimethylamine, trimethylamine, n-propylamine, diisopropylamine, and t-butylamine.
Claim 6
Dependent Claim
43 words
An electrolytic capacitor as claimed in claim 2 wherein said elecrolyte contains additionally at least one inorganic acid selected from about 0.075 wt % H 3 PO and from about 2.5 wt % to about 4.6 wt % H 3 BO 3 .
Claim 7
Dependent Claim
19 words
An electrolytic capacitor as claimed in claim 2 wherin said electrolyte additionally contains up to 4 wt % water.
Claim 8
Dependent Claim
22 words
An electrolytic capacitor according to claim 1 wherein the solvent is selected from the group consisting of glycol and a glycol-methylcellosolve mixture.
Claim 9
Dependent Claim
18 words
An electrolytic capacitor according to claim 7 wherein the solute is ammmonium succinamate and the solvent is glycol.
Claim 10
Dependent Claim
20 words
An electrolytic capacitor according to claim 7 wherein the solute is ammonium succinamate and the solvent is a glycolmethylcellosolve mixture.
Claim 11
Dependent Claim
15 words
An electroyltic capacitor according to claim 1 wherein said valve-metal electrode is an aluminum electrode.
References Cited (Backward Citations)
US3346782A
Cited
US3490740A
Cited
US3835055A
Cited
US3518499A
Cited
US3547423A
Cited
US3696037A
Cited
US3812039A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-25 | 1982-03-27 | 1982-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-25 | 1986-03-27 | 1986-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-25 | 1990-03-27 | 1990-09-26 | $7700.00 | Window Closed / Lapsed |