Patent US2874848A successfully refreshed from Google Patents.
US2874848A
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US
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Pressure leaf filter with pneumatic vibrator for residue removal
Assignee: BERKSHIRE MANUFACTURING Co
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Filing: 1955-04-05
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Granted: 1959-02-24
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Expires: 1975-04-05
Abstract
No abstract record available.
Inventors
- 👤 Edward S Cannon
- 👤 Don B Lash
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:42
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/62; B01D29/70; B01D29/72; B01D29/39
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1867397A
Cited
US2365360A
Cited
US2480320A
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US2460416A
Cited
US2778612A
Cited
US2743090A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-23 | 1962-08-25 | 1963-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-23 | 1966-08-25 | 1967-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-23 | 1970-08-25 | 1971-02-24 | $7700.00 | Window Closed / Lapsed |