Patent US3991754A successfully refreshed from Google Patents.
US3520788A
Expired / Lapsed
US
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Process for the extension of the effective surface of aluminium electrodes or foils for electrolytic capacitors
Assignee: TDK Foil Italy SpA
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Filing: 1967-01-13
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Granted: 1970-07-14
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Expires: 1987-01-13
Abstract
No abstract record available.
Inventors
- 👤 Hans Werner Paehr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:02
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; H01G9/048; H01G9/055; C; C25; C25F; C25F3/00; C25F3/02; C25F3/04; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12472
Claims Analysis
Total Claims: 0
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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) | 1973-07-13 | 1974-01-12 | 1974-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-13 | 1978-01-12 | 1978-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-13 | 1982-01-12 | 1982-07-14 | $7700.00 | Window Closed / Lapsed |