US3909682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitor and electrolyte
Assignee: Sprague Electric Co
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Filing: 1974-11-08
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Granted: 1975-09-30
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Expires: 1994-11-08
Abstract
Abstract An aluminum electrolytic capacitor having dimethylammonium acid salts in the electrolyte solution.
Inventors
- 👤 Franz S Dunkl
- 👤 Sidney D Ross
- 👤 Manuel Finkelstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:09
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/022
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
116 words
AN ELECTRICAL CAPACITOR COMPRISING A CAPACITOR HOUSING, A CAPACITANCE SECTION WITHIN THE HOUSING, SAID SECTION HAVING AT LEAST A PAIR OF SPACED ELECTRODES ON OF WHICH IS COATED WITH A DIELECTRIC FILM, AND AN ELECTROLYTE IN CONTACT WITH SAID ELECTRODES, SAID ELECTROLYTE CONSISTING ESSENTIALLY OF A SOLVENT AND A SOLUTE PREPARED FROM A LIQUID MIXTURE OFF A SUBSTITUTED AMIDE AND AN ACID SELECTED FROM THE GROUP CONSISTING OF (1) PHOSPHOTUNGSTIC ACID, (2) A COMBINATION OF SALICYLIC ACID AND BORIC ACID, (3) A COMBINATION OF PYROCATECHOL AND BORIC ACID, AND (4) A COMBINATION OF 2,3-NAPHTHALENEDIOL AND BORIC ACID, SAID MIXTURE BEING REACTED AT ABOUT 125*C FO AT LEAST 2 HOURS AND SAID ELECTROLYTE HAVING A LOW RESISTIVITY.
Claim 2
Dependent Claim
116 words
AN ELECTRICAL CAPACITOR COMPRISING A CAPACITOR HOUSING, A CAPACITANCE SECTION WITHIN THE HOUSING, SAID SECTION HAVING AT LEAST A PAIR OF SPACED ELECTRODES ON OF WHICH IS COATED WITH A DIELECTRIC FILM, AND AN ELECTROLYTE IN CONTACT WITH SAID ELECTRODES, SAID ELECTROLYTE CONSISTING ESSENTIALLY OF A SOLVENT AND A SOLUTE PREPARED FROM A LIQUID MIXTURE OFF A SUBSTITUTED AMIDE AND AN ACID SELECTED FROM THE GROUP CONSISTING OF (1) PHOSPHOTUNGSTIC ACID, (2) A COMBINATION OF SALICYLIC ACID AND BORIC ACID, (3) A COMBINATION OF PYROCATECHOL AND BORIC ACID, AND (4) A COMBINATION OF 2,3-NAPHTHALENEDIOL AND BORIC ACID, SAID MIXTURE BEING REACTED AT ABOUT 125*C FO AT LEAST 2 HOURS AND SAID ELECTROLYTE HAVING A LOW RESISTIVITY.
Claim 3
Dependent Claim
19 words
A capacitor as claimed in claim 1 having a resistivity of from about 100 to 600 ohm-cm. at 125*C.
Claim 4
Dependent Claim
13 words
A capacitor as claimed in claim 1 wherein the substituted amide is dimethylformamide.
Claim 5
Dependent Claim
13 words
A capacitor as claimed in claim 1 wherein the substituted amide is dimethylacetamide.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |