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Patent US2390841A successfully refreshed from Google Patents.
US2390841A
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Assignee: Individual
•
Filing: 1943-11-25
•
Granted: 1945-12-11
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Expires: 1963-11-25
Abstract
No abstract record available.
Inventors
- 👤 Longden Erich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:00
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/02; F02M35/024; B; B01; B01D; B01D21/00; B01D21/0012; B01D21/26; B01D21/267; B01D29/00; B01D29/11; B01D29/114; B01D29/115; B01D29/88; B01D29/885; B01D29/90; B01D29/908; B01D35/00; B01D35/16; B01D35/22; B01D50/00; B01D50/20
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) | 1948-12-10 | 1949-06-11 | 1949-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-12-10 | 1953-06-11 | 1953-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-12-10 | 1957-06-11 | 1957-12-11 | $7700.00 | Window Closed / Lapsed |