US3733011A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Feeding of powders
Assignee: Cities Service Co
•
Filing: 1971-02-08
•
Granted: 1973-05-15
•
Expires: 1991-02-08
Abstract
Abstract Constant mass-rate feeding of powders is improved by supplying the powder to a feeder in fluid form, and at a uniform bulk density, from a bed of the powder. The depth of the powder bed is maintained essentially constant, thus providing a more constant head of pressure upon the powder being supplied to the feeder.
Inventors
- 👤 R Driscoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:35
CPC Classifications
B; B65; B65G; B65G53/00; B65G53/04; B65G53/06; B65G53/10; B65G53/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
169 words
Powder feeding apparatus comprising: a. a receptacle for containing powder, b. means for supplying powder to a fluid bed of powder contained in the receptacle, c. a feeder adapted to deliver powder at a constant mass rate, d. means for conveying fluid powder from the receptacle to the powder inlet of the feeder, said conveying means being adapted for discharge of fluid powder from the bed at a first removal point through an opening in the wall of the receptacle, the opening being located near the bottom of the fluid powder bed, e. means for removing fluid powder from the bed in the receptacle at a second point which is at a higher elevation than the first powder removal point, f. means for removing powder from the fluid bed in the receptacle at a third point, means for agitating powder removed at the third point with a nonreactive gas, and means for conveying the thus agitated powder to the top of the fluid powder bed contained in the receptacle.
Claim 2
Dependent Claim
169 words
Powder feeding apparatus comprising: a. a receptacle for containing powder, b. means for supplying powder to a fluid bed of powder contained in the receptacle, c. a feeder adapted to deliver powder at a constant mass rate, d. means for conveying fluid powder from the receptacle to the powder inlet of the feeder, said conveying means being adapted for discharge of fluid powder from the bed at a first removal point through an opening in the wall of the receptacle, the opening being located near the bottom of the fluid powder bed, e. means for removing fluid powder from the bed in the receptacle at a second point which is at a higher elevation than the first powder removal point, f. means for removing powder from the fluid bed in the receptacle at a third point, means for agitating powder removed at the third point with a nonreactive gas, and means for conveying the thus agitated powder to the top of the fluid powder bed contained in the receptacle.
Claim 3
Dependent Claim
63 words
Apparatus of claim 1 in which the means of subparagraph (e) comprises a conduit which intercommunicates with the interior of the powder receptacle, said conduit having an opening adapted for free flow of powder into the conduit, and said opening of the conduit being located at a substantially higher elevation than said powder-discharge outlet which is employed in conveying powder to the feeder.
Claim 4
Dependent Claim
23 words
Apparatus of claim 1 including means for introducing a nonreactive gas into the powder bed at a locus near said powder discharge outlet.
References Cited (Backward Citations)
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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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |