US2418989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter comprising a revolvable drum containing a mass of loose filter material
Assignee: SHANDOR
•
Filing: 1943-12-13
•
Granted: 1947-04-15
•
Expires: 1963-12-13
Abstract
No abstract record available.
Inventors
- 👤 Marion E Shandor
- 👤 Donath Ralph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:45
CPC Classifications
B; B01; B01D; B01D24/00; B01D24/02; B01D24/04; B01D24/46; B01D24/4631; B01D24/4642; B01D24/4668; B01D24/4673
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US136364A
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US312527A
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US343251A
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US662556A
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US1047534A
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US1499600A
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FR591099A
Cited
US2093311A
Cited
US2330197A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-04-14 | 1950-10-14 | 1951-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-04-14 | 1954-10-14 | 1955-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-04-14 | 1958-10-14 | 1959-04-15 | $7700.00 | Window Closed / Lapsed |