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US1854475A
Expired / Lapsed
US
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Method for electrically charging fluids
Assignee: Individual
•
Filing: 1920-11-27
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Granted: 1932-04-19
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Expires: 1940-11-27
Abstract
No abstract record available.
Inventors
- 👤 Littlefield Edgar Earle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:10
CPC Classifications
F; F02; F02M; F02M21/00; F02M2700/00; F02M2700/12; Y; Y10; Y10S; Y10S159/00; Y10S159/26
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) | 1935-04-19 | 1935-10-19 | 1936-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-04-19 | 1939-10-19 | 1940-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-04-19 | 1943-10-19 | 1944-04-19 | $7700.00 | Window Closed / Lapsed |