Patent US575946A successfully refreshed from Google Patents.
US3249395A
Expired / Lapsed
US
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Gas-solids reaction system
Assignee: Individual
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Filing: 1959-02-20
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Granted: 1966-05-03
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Expires: 1979-02-20
Abstract
No abstract record available.
Inventors
- 👤 Ralph P Levey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:01
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J2219/00; B01J2219/19; B01J2219/194; B01J2219/1941; B01J2219/1946
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
109 words
IN A FLUIDIZING PROCESS WHEREIN A BED OF PARTICULATE SOLIDS IS ESTABLISHED, AND A GAS IS FORCED UPWARDS THROUGH SAID BED AT A RATE SUFFICIENT TO FLUIDIZE SAID PARTICLES, THE MOLAR QUANTITY OF SAID GAS BEING CONSTANT IN PASSING THROUGH SAID BED, THE IMPROVEMENT WHEREIN SAID BED IS ESTABLISHED IN ACCORDANCE WITH THE RELATIONSHIP DB=DT(1/(1+(H$P/PT)))**1/2 WHERE DB=THE DIAMETER OF THE BED AT THE BOTTOM, IN FEET, DT=THE DIAMETER OF THE BED AT THE TOP, IN FEET H=THE HEIGHT OF THE BED, IN FEET, $P=CHANGE IN PRESSURE THROUGH THE BED, IN POUNDS PER SQUARE INCH PER FOOT, AND PT=PRESSURE OF GAS AT TOP OF BED, IN POUNDS PER SQUARE INCH.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |