US4437946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of aluminum electrolytic capacitor foil
Assignee: UNITED CHEMI-CON MANUFACTURING Inc
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Filing: 1983-08-31
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Granted: 1984-03-20
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Expires: 2003-08-31
Abstract
Abstract Aluminum electrolytic capacitor foil is stabilized by passing the foil from an anodization step through a bath containing an aqueous borate solution at a temperature of at least 80 DEG C. and a pH of 8.5 to 9.5. After stabilization, the foil is reanodized.
Inventors
- 👤 Walter J. Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:39
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/0029; H01G9/0032; C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/12; C25D11/18; C25D11/24
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
59 words
A process for stabilizing anodized capacitor foil comprising passing said foil from an anodization step through a stabilizing bath containing a borate solution at a temperature of at least 80° C. and at a pH of 8.5 to 9.5 for from 2 to 8 minutes, and reanodizing, the cycle of said stabilizing and reanodizing being performed at least twice.
Claim 2
Dependent Claim
59 words
A process for stabilizing anodized capacitor foil comprising passing said foil from an anodization step through a stabilizing bath containing a borate solution at a temperature of at least 80° C. and at a pH of 8.5 to 9.5 for from 2 to 8 minutes, and reanodizing, the cycle of said stabilizing and reanodizing being performed at least twice.
Claim 3
Dependent Claim
13 words
A process according to claim 1 wherein there are three of said cycles.
Claim 4
Dependent Claim
17 words
A process according to claim 1 wherein said temperature is 90° to 100° C. in said bath.
Claim 5
Dependent Claim
17 words
A process according to claim 1 wherein said solution is a 0.001 to 0.05 M borax solution.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |