Aluminum electrode electrolytic capacitor construction
Abstract
Abstract BOTH THE PASSIVATION OF ALUMINUM FOIL PARTICULARLY FOR USE AS ELECTRODE IN WET ELECTROLYTIC CAPACITORS AND THE INHIBITION OF THE ALUMINUM-WATER-REACTION WITHIN THE COMPLETED CAPACITOR ARE DESCRIBED. PRETREATMENT OF ETCHED ALUMINUM FOIL INCLUDED THE COMBINED STEPS OF IMMERSION IN A BOILING AQUEOUS SOLUTION CONTAINING CRO3 AND H3PO4 FOLLOWED BY A 3-MINUTE IMMERSION IN A BOILING SOLUTION OF CONTROLLED PH CONTAINING H2PO4-, SIO2= AND CRO3, INHIBITION OF ALUMINUM IN A WET ELECTROLTIC CAPACITOR IS AFFORDED BY THE ADDITION OF A CONCENTRATION OF AT LEAST ONE OF THE FOLLOWING INHIBITING IONS TO THE LIQUID ELECTROLYTEL ; PHOSPHATE, PHOSPHITE, PERIODATE, ARSENATE, TUNGSTATE, SILICATE VANADATE (VANDADATE), TELLURATE, TELLURITE, ANTIMONATE, ARSENITE, SELENATE, SULFITE AND GERMANATE.
Inventors
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Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |