Patent US2220887A successfully refreshed from Google Patents.
US2220887A
Expired / Lapsed
US
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Electrolytic condenser
Assignee: Hartford National Bank and Trust Co
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Filing: 1938-02-10
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Granted: 1940-11-12
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Expires: 1958-02-10
Abstract
No abstract record available.
Inventors
- 👤 Claass Anthony Freder Johannes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:19
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/145; H01G9/004; H01G9/04; H01G9/048
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-11-12 | 1944-05-13 | 1944-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-11-12 | 1948-05-13 | 1948-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-11-12 | 1952-05-13 | 1952-11-12 | $7700.00 | Window Closed / Lapsed |