Patent US3807705A successfully refreshed from Google Patents.
US3807705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for solids blending
Assignee: EIDP Inc
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Filing: 1972-06-28
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Granted: 1974-04-30
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Expires: 1992-06-28
Abstract
Abstract A process and apparatus for the blending of a bed of particulate solids operating cyclically by selectively regulated downward gravity flow of a fraction of the solids, fluidized mixing outside of the bed, followed by recycle to the top of the bed.
Inventors
- 👤 R Humkey
- 👤 D Marshall
- 👤 D Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:45
CPC Classifications
B; B01; B01F; B01F33/00; B01F33/40; B01F33/405; B01F33/4051; B01F33/40511
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
68 words
The method of blending a bed of particulate solids comprising, in sequence, maintaining different residence times of separate weight fractions of said solids within said bed while withdrawing said solids in downward gravity flow from said bed, feeding said weight fractions of solids to a common gas fluidization mixing zone, intimately mixing said solids by gas fluidization, and recycling said solids from said mixing zone to said bed.
Claim 2
Independent Claim
68 words
The method of blending a bed of particulate solids comprising, in sequence, maintaining different residence times of separate weight fractions of said solids within said bed while withdrawing said solids in downward gravity flow from said bed, feeding said weight fractions of solids to a common gas fluidization mixing zone, intimately mixing said solids by gas fluidization, and recycling said solids from said mixing zone to said bed.
Claim 3
Dependent Claim
41 words
The method of blending a bed of particulate solids according to claim 1 wherein the fraction of said solids fluidized at any one time is in the range of about 0.01 to about 0.20 of the total quantity of said solids.
Claim 4
Dependent Claim
33 words
The method of blending a bed of particulate solids according to claim 1 wherein said separate weight fractions of solids withdrawn from said bed exceed five in number, all substantially equal in magnitude.
Claim 5
Dependent Claim
58 words
The method of blending a bed of particulate solids according to claim 1 wherein said separate weight fractions are substantially equal in magnitude and the residence time distribution of solids constituting said separate weight fractions of said solids withdrawn from said bed is preselected to be approximately linear with respect to the number of said separate weight fractions.
Claim 6
Dependent Claim
60 words
The method of blending a bed of particulate solids according to claim 1 wherein said separate weight fractions are substantially equal in magnitude and the ratio of the maximum residence time to the minimum residence time of solids constituting said separate weight fractions of said solids withdrawn from said bed is in the range of about 1.5 to about 5.0.
Claim 7
Dependent Claim
82 words
Apparatus for blending a bed of particulate solids comprising, in combination, a vessel containing said bed of particulate solids, gas fluidization solids mixing means, means maintaining different residence times of separate weight fractions of said solids within said bed while withdrawing said solids in downward gravity flow from said bed and delivering said solids to said gas fluidization mixing means, and solids recycling means delivering said solids in intimately mixed condition from said gas fluidization solids mixing means back to said bed.
Claim 8
Dependent Claim
82 words
Apparatus for blending a bed of particulate solids comprising, in combination, a vessel containing said bed of particulate solids, gas fluidization solids mixing means, means maintaining different residence times of separate weight fractions of said solids within said bed while withdrawing said solids in downward gravity flow from said bed and delivering said solids to said gas fluidization mixing means, and solids recycling means delivering said solids in intimately mixed condition from said gas fluidization solids mixing means back to said bed.
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) | 1977-04-29 | 1977-10-29 | 1978-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-29 | 1981-10-29 | 1982-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-29 | 1985-10-29 | 1986-04-30 | $7700.00 | Window Closed / Lapsed |