Patent US2528065A successfully refreshed from Google Patents.
US2528065A
Expired / Lapsed
US
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Liquid-permeable tank bottom for beds of granular material
Assignee: Dorr Co
•
Filing: 1948-01-22
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Granted: 1950-10-31
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Expires: 1968-01-22
Abstract
No abstract record available.
Inventors
- 👤 Harry E Lundberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:01
CPC Classifications
B; B01; B01D; B01D24/00; B01D24/02; B01D24/10; B01D24/14; B01D2201/00; B01D2201/04; B01D2201/0415
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US260714A
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US473011A
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US524155A
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US1572398A
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US1698079A
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US1747470A
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DE646476C
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US2032668A
Cited
US2139924A
Cited
US2387101A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-30 | 1954-05-01 | 1954-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-30 | 1958-05-01 | 1958-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-30 | 1962-05-01 | 1962-10-31 | $7700.00 | Window Closed / Lapsed |