Patent US4184893A successfully refreshed from Google Patents.
US4184893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulsed rinse of particulate beds
Assignee: EIDP Inc
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Filing: 1976-07-13
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Granted: 1980-01-22
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Expires: 1996-07-13
Abstract
Abstract A method of rinsing a wetted particulate solid bed in liquid-contacting service by gravity draining or by gas blowing the bed and then rinsing it with successive gas-impelled pulses of rinse liquid.
Inventors
- 👤 David O. Halvorson
- 👤 Walter J. Sloan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:24
CPC Classifications
B; B01; B01J; B01J49/00; B01J49/60
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
146 words
A process for removing the void volume of process liquid from a wetted, fixed or stabilized bed of particulate solids comprising, in sequence: (a) downward blowing said fixed or stabilized bed of solids with a gas to displace a substantial portion of said process liquid from said voids, (b) quickly adding a preselected volume of rinse liquid at a preselected temperature over the entire top of said bed, said preselected volume being limited to a fraction of the total volume of said bed of solids, (c) quickly downward blowing said bed of solids with a gas to impel said rinse liquid through said bed, and (d) repeating steps (b) and (c) until the desired degree of removal of said void-retained process liquid is effected, or until the sum of said rinse liquid volumes (b) is approximately equal to the total volume of said bed of solids.
Claim 2
Dependent Claim
146 words
A process for removing the void volume of process liquid from a wetted, fixed or stabilized bed of particulate solids comprising, in sequence: (a) downward blowing said fixed or stabilized bed of solids with a gas to displace a substantial portion of said process liquid from said voids, (b) quickly adding a preselected volume of rinse liquid at a preselected temperature over the entire top of said bed, said preselected volume being limited to a fraction of the total volume of said bed of solids, (c) quickly downward blowing said bed of solids with a gas to impel said rinse liquid through said bed, and (d) repeating steps (b) and (c) until the desired degree of removal of said void-retained process liquid is effected, or until the sum of said rinse liquid volumes (b) is approximately equal to the total volume of said bed of solids.
Claim 3
Dependent Claim
42 words
A process for removing the void volume of process liquid from a wetted, fixed or stabilized bed of particulate solids according to claim 1 in which either or both said process liquid and said added rinse liquid are removed by downward suction.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-21 | 1983-07-23 | 1984-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-21 | 1987-07-23 | 1988-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-21 | 1991-07-23 | 1992-01-22 | $7700.00 | Window Closed / Lapsed |