US2423329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil filtration
Assignee: Individual
•
Filing: 1943-04-15
•
Granted: 1947-07-01
•
Expires: 1963-04-15
Abstract
No abstract record available.
Inventors
- 👤 Clair Camille Clare Sprankl Le
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:25
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/14; B01D29/00; B01D29/88
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1913401A
Cited
US1020774A
Cited
US1619118A
Cited
US1703335A
Cited
US1913402A
Cited
US1948479A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-30 | 1950-12-30 | 1951-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-30 | 1954-12-30 | 1955-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-30 | 1958-12-30 | 1959-07-01 | $7700.00 | Window Closed / Lapsed |