US1684684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic rectifier
Assignee: ELECTRO METALLURG CO
•
Filing: 1927-03-08
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Granted: 1928-09-18
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Expires: 1947-03-08
Abstract
No abstract record available.
Inventors
- 👤 William C Read
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:46
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; H01G9/042; H01G9/0425
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) | 1931-09-18 | 1932-03-19 | 1932-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-09-18 | 1936-03-19 | 1936-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-09-18 | 1940-03-19 | 1940-09-18 | $7700.00 | Window Closed / Lapsed |