US2656930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drainage leaf attachment means for leaf type filters
Assignee: REVERE SUGAR REFINERY
•
Filing: 1950-10-25
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Granted: 1953-10-27
•
Expires: 1970-10-25
Abstract
No abstract record available.
Inventors
- 👤 Vries Reinier P De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:31
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/39; B01D29/41
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US673280A
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FR382959A
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US970880A
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US1006830A
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US1381944A
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US1620415A
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US1767523A
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GB338567A
Cited
DE643550C
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US1997878A
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US2084952A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-26 | 1957-04-27 | 1957-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-26 | 1961-04-27 | 1961-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-26 | 1965-04-27 | 1965-10-27 | $7700.00 | Window Closed / Lapsed |