Patent US4537665A successfully refreshed from Google Patents.
US4537665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of aluminum foil capacitor electrodes
Assignee: Sprague Electric Co
•
Filing: 1984-09-04
•
Granted: 1985-08-27
•
Expires: 2004-09-04
Abstract
Abstract In the production of low voltage aluminum foil capacitor electrodes, etched and clean foil is subjected to a thermal treatment at about 595 DEG to 650 DEG C. and then anodized in an adipate formation electrolyte. The electrolyte may contain a minor amount of a phosphate salt, or the final reanodization may be carried out in a phosphate electrolyte.
Inventors
- 👤 Trung H. Nguyen
- 👤 Clinton E. Hutchins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:00
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/0029; H01G9/0032; C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/06; C25D11/08; C25D11/10; C25D11/12; C25D11/16; H01G9/004; H01G9/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
45 words
In the manufacture of low-voltage aluminum foil electrolytic capacitor electrodes including etching said foil, cleaning it, and anodizing said foil, the improvement comprising thermal treating said cleaned foil at about 595° to 650° C. and then anodizing said treated foil in an adipate formation electrolyte.
Claim 2
Dependent Claim
45 words
In the manufacture of low-voltage aluminum foil electrolytic capacitor electrodes including etching said foil, cleaning it, and anodizing said foil, the improvement comprising thermal treating said cleaned foil at about 595° to 650° C. and then anodizing said treated foil in an adipate formation electrolyte.
Claim 3
Dependent Claim
21 words
A process according to claim 1 wherein said adipate is selected from the group consisting of alkali metal and ammonium adipates.
Claim 4
Dependent Claim
14 words
A process according to claim 2 wherein said formation electrolyte contains a phosphate salt.
Claim 5
Dependent Claim
22 words
A process according to claim 3 wherein 0.5 to 12% of said adipate and 0.002 to 0.09% of said phosphate are present.
Claim 6
Dependent Claim
18 words
A process according to claim 4 wherein 5% of said adipate and 0.05% of said phosphate are present.
Claim 7
Dependent Claim
20 words
A process according to claim 2 wherein said foil is subjected to a final reanodization in a phosphate salt electrolyte.
Claim 8
Dependent Claim
36 words
A process according to claim 6 wherein an aqueous solution of 0.5 to 12% adipate is used as main formation electrolyte and an aqueous solution of 0.05 to 0.5% phosphate is used as final anodization electrolyte.
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) | 1988-08-26 | 1989-02-25 | 1989-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-26 | 1993-02-25 | 1993-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-26 | 1997-02-25 | 1997-08-27 | $7700.00 | Window Closed / Lapsed |