Patent US3771237A successfully refreshed from Google Patents.
US3771237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for drying damp powders
Assignee: GEA Process Engineering AS
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Filing: 1972-04-04
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Granted: 1973-11-13
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Expires: 1992-04-04
Abstract
Abstract A device for drying powders with a high moisture content comprising a drying chamber with a powder inlet and a drying gas outlet at the top and a powder outlet and a drying gas intake at the bottom, a perforated supporting plate being mounted in the upper portion of the chamber, a rotating distributor being provided centrally beneath the powder inlet above the perforated plate. Immediately above the perforated plate a number of heating elements are arranged, whereas one or several overflows leads from the perforated plate down to an additional perforated supporting plate mounted below the first one and provided with a number of vertical guiding walls and a number of overflows communicating with the powder outlet.
Inventors
- 👤 O Hansen
- 👤 T Kahler
- 👤 P Mengel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:08
CPC Classifications
F; F26; F26B; F26B3/00; F26B3/02; F26B3/06; F26B3/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
158 words
An apparatus for drying powders with a high moisture content including a generally cylindrical drying chamber having a vertical axis, a powder inlet and a drying gas outlet at the top, and a final powder outlet and a drying gas intake at the bottom, comprising: a first perforated supporting plate mounted in the topmost portion of the chamber, a rotating distributor disposed centrally underneath the powder inlet and above the supporting plate, a plurality of heating elements arranged immediately above the supporting plate in the form of radial, vertical walls, an intermediate powder outlet from the supporting plate in the form of at least one first overflow, a second perforated supporting plate mounted below the first supporting plate and the intermediate powder outlet, at least one vertical guiding wall for the fluidized powder fitted to the second supporting plate, and At least one second overflow fitted to the second supporting plate that communicates with the final powder outlet.
Claim 2
Independent Claim
158 words
An apparatus for drying powders with a high moisture content including a generally cylindrical drying chamber having a vertical axis, a powder inlet and a drying gas outlet at the top, and a final powder outlet and a drying gas intake at the bottom, comprising: a first perforated supporting plate mounted in the topmost portion of the chamber, a rotating distributor disposed centrally underneath the powder inlet and above the supporting plate, a plurality of heating elements arranged immediately above the supporting plate in the form of radial, vertical walls, an intermediate powder outlet from the supporting plate in the form of at least one first overflow, a second perforated supporting plate mounted below the first supporting plate and the intermediate powder outlet, at least one vertical guiding wall for the fluidized powder fitted to the second supporting plate, and At least one second overflow fitted to the second supporting plate that communicates with the final powder outlet.
Claim 3
Dependent Claim
41 words
An apparatus as claimed in claim 1 wherein the rotating distributor comprises a rotating disc of small diameter in relation to the diameter of the chamber, the disc having ribs on its topside designed to hurl the powder from the disc.
Claim 4
Dependent Claim
29 words
An apparatus as claimed in claim 1 wherein the vertical guiding wall is in the form of a spiral, and has a heating element along part of its length.
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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |