US2560581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shielding shoe for drums and similar filters
Assignee: Individual
•
Filing: 1946-03-06
•
Granted: 1951-07-17
•
Expires: 1966-03-06
Abstract
No abstract record available.
Inventors
- 👤 Leffler Nils Gustav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:19
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/06; B01D33/44; B01D33/46; B01D33/466
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1848478A
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US1211739A
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US1377765A
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US1627882A
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US1876399A
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US1937426A
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US2053664A
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US2274641A
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US2418777A
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US2283495A
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US2285649A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-16 | 1955-01-15 | 1955-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-16 | 1959-01-15 | 1959-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-16 | 1963-01-15 | 1963-07-17 | $7700.00 | Window Closed / Lapsed |