Patent US2548875A successfully refreshed from Google Patents.
US2548875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contacting gases and solids
Assignee: MW Kellogg Co
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Filing: 1947-01-07
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Granted: 1951-04-17
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Expires: 1967-01-07
Abstract
No abstract record available.
Inventors
- 👤 William J Degnen
- 👤 Luther R Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:10
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/005; B01J8/006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
A METHOD FOR CONTACTING A GAS WITH FINELY DIVIDED SOLIDS WHICH COMPRISES PASSING SAID GAS UPWARDLY IN A CONTACT ZONE THROUGH A LOOSE MASS OF FINELY DIVIDED PARTICLES OF SAID SOLIDS AT A RELATIVELY LOW VELOCITY TO MAINTAIN THE FINELY DIVIDED SOLIDS AS A LOWER DENSE PHASE IN WHICH THE CONTACT PARTICLES ARE MAINTAINED IN RELATIVELY HIGH CONCENTRATION IN A FLUIDIZED PSEUDO-LIQUID CONDITION AND AS AN UPPER DIFFUSE PHASE CONTAINING SOLIDS IN LOW CONCENTRATION, WITHDRAWING A PORTION OF SAID GAS FROM SAID CONTACT ZONE THROUGH A POROUS MEMBRANE WHICH IS SUBSTANTIALLY IMPERVIOUS TO SAID SOLID PARTICLES AND WHICH CONTACTS SAID DENSE FLUIDIZED MASS OF SOILDS OVER A SUBSTANTIAL AREA OF SAID POROUS MEMBRANCE, WITHDRAWING ANOTHER PORTION OF SAID GAS DIRECTLY FROM SAID UPPER DIFFUSE PHASE AND FROM SAID CONTACT ZONE WITHOUT PASSAGE THROUGH SAID POROUS MEMBRANE, AND REINTRODUCING SAID LAST-MENTIONED WITHDRAWN GAS INTO SAID CONTACT ZONE AT A LOW POINT THEREOF AND INTO CONTACT WITH SAID FLUIDIZED MASS OF SOLIDS.
Claim 2
Independent Claim
160 words
A METHOD FOR CONTACTING A GAS WITH FINELY DIVIDED SOLIDS WHICH COMPRISES PASSING SAID GAS UPWARDLY IN A CONTACT ZONE THROUGH A LOOSE MASS OF FINELY DIVIDED PARTICLES OF SAID SOLIDS AT A RELATIVELY LOW VELOCITY TO MAINTAIN THE FINELY DIVIDED SOLIDS AS A LOWER DENSE PHASE IN WHICH THE CONTACT PARTICLES ARE MAINTAINED IN RELATIVELY HIGH CONCENTRATION IN A FLUIDIZED PSEUDO-LIQUID CONDITION AND AS AN UPPER DIFFUSE PHASE CONTAINING SOLIDS IN LOW CONCENTRATION, WITHDRAWING A PORTION OF SAID GAS FROM SAID CONTACT ZONE THROUGH A POROUS MEMBRANE WHICH IS SUBSTANTIALLY IMPERVIOUS TO SAID SOLID PARTICLES AND WHICH CONTACTS SAID DENSE FLUIDIZED MASS OF SOILDS OVER A SUBSTANTIAL AREA OF SAID POROUS MEMBRANCE, WITHDRAWING ANOTHER PORTION OF SAID GAS DIRECTLY FROM SAID UPPER DIFFUSE PHASE AND FROM SAID CONTACT ZONE WITHOUT PASSAGE THROUGH SAID POROUS MEMBRANE, AND REINTRODUCING SAID LAST-MENTIONED WITHDRAWN GAS INTO SAID CONTACT ZONE AT A LOW POINT THEREOF AND INTO CONTACT WITH SAID FLUIDIZED MASS OF SOLIDS.
References Cited (Backward Citations)
US2401739A
Cited
US2429751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-16 | 1954-10-16 | 1955-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-16 | 1958-10-16 | 1959-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-16 | 1962-10-16 | 1963-04-17 | $7700.00 | Window Closed / Lapsed |