US3266962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of etching electrode foils for electrolytic capacitors
Assignee: Rio Tinto Switzerland AG
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Filing: 1962-08-28
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Granted: 1966-08-16
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Expires: 1982-08-28
Abstract
No abstract record available.
Inventors
- 👤 Post Wolfgang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:25
CPC Classifications
C; C25; C25F; C25F3/00; C25F3/02; C25F3/04; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/20; H; H01; H01G; H01G9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
A PROCESS OF MAKING ETCHED ELECTRODE METAL FOILS WITH AN INCREASED ACTIVE SURFACE AREA FOR ELECTROLYTIC CAPACITORS, WHICH COMPRISES ETCHING A METAL FOIL IN AN ETCH BATH, SUBJECTING THE FOIL TO LIQUID AND LIGHT PERMEABILITY TESTS, AND TEMINATING THE ETCHING STEP WHEN THE TEST INDICATE THAT THE FOIL IS PERMEABLE TO LIQUID BUT IMPERMEABLE TO LIGHT.
Claim 2
Dependent Claim
56 words
A PROCESS OF MAKING ETCHED ELECTRODE METAL FOILS WITH AN INCREASED ACTIVE SURFACE AREA FOR ELECTROLYTIC CAPACITORS, WHICH COMPRISES ETCHING A METAL FOIL IN AN ETCH BATH, SUBJECTING THE FOIL TO LIQUID AND LIGHT PERMEABILITY TESTS, AND TEMINATING THE ETCHING STEP WHEN THE TEST INDICATE THAT THE FOIL IS PERMEABLE TO LIQUID BUT IMPERMEABLE TO LIGHT.
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) | 1969-08-15 | 1970-02-14 | 1970-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-15 | 1974-02-14 | 1974-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-15 | 1978-02-14 | 1978-08-16 | $7700.00 | Window Closed / Lapsed |