Patent US3598539A successfully refreshed from Google Patents.
US3598539A
Expired / Lapsed
US
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Vessel for contacting fluids and a bed of granular solids
Assignee: Universal Oil Products Co
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Filing: 1968-12-11
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Granted: 1971-08-10
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Expires: 1988-12-11
Abstract
Abstract AN IMPROVED VESSEL FOR CONTACTING FLUIDS AND A BED OF GRANULAR SOLIDS WHEREIN THE FLUID PASSES THROUGH THE AFORESAID BED. A PLURALITY OF BASKET SHAPED SCREENS ARE PARTIALLY EMBEDDED IN THE AFORESAID BED OF GRANULAR SOLIDS. THAT PORTION OF EACH SCREEN HAVING THE GREATEST SURFACE AREA IS THE PORTION MOST DEEPLY EMBEDDED. D R A W I N G
Inventors
- 👤 Antonio B Pizzato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:25
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/02; B01J8/0278; Y; Y10; Y10S; Y10S261/00; Y10S261/72
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |