US2821469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grate type pelletizing method and apparatus
Assignee: University of Minnesota Twin Cities
•
Filing: 1953-02-06
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Granted: 1958-01-28
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Expires: 1973-02-06
Abstract
No abstract record available.
Inventors
- 👤 Edward W Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:55
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/14; C22B1/24; C22B1/2413; B; B01; B01J; B01J2/00; B01J2/26
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
95 words
THE METHOD OF BURNING SUBSTANTIALLY SPHERICAL ORE COMPACTS WITHOUT UNDUE FLATTENING WHICH COMPRISES DEPOSITING FUEL-CONTAINING ORE COMPACTS IN A LAYER OF SUBSTANTIALLY UNIFORM THICKNESS ON THE UPPER SURFACE OF A MOVING GRATE, IGNITING SAID LAYER ALONG A TRANSVERSE LINE ACROSS THE GRATE AS THE LAYER IS MOVED THEREON, THEN DEPOSITING SUCCESSIVELY A PLURALITY OF FURTHER LAYERS OF FUELCONTAINING COMPACTS, BLOWING AIR UPWARDLY THROUGH THOSE PORTIONS OF THE GRATE UPON WHICH SAID SUCCESSIVE PLURALITY BY LAYERS ARE DEPOSITED FOR COMBUSTION OF THE FUEL IN SAID COMPACTS AND THEN REMOVING ALL OF THE COMPACTS FROM SAID GRATE.
Claim 2
Independent Claim
95 words
THE METHOD OF BURNING SUBSTANTIALLY SPHERICAL ORE COMPACTS WITHOUT UNDUE FLATTENING WHICH COMPRISES DEPOSITING FUEL-CONTAINING ORE COMPACTS IN A LAYER OF SUBSTANTIALLY UNIFORM THICKNESS ON THE UPPER SURFACE OF A MOVING GRATE, IGNITING SAID LAYER ALONG A TRANSVERSE LINE ACROSS THE GRATE AS THE LAYER IS MOVED THEREON, THEN DEPOSITING SUCCESSIVELY A PLURALITY OF FURTHER LAYERS OF FUELCONTAINING COMPACTS, BLOWING AIR UPWARDLY THROUGH THOSE PORTIONS OF THE GRATE UPON WHICH SAID SUCCESSIVE PLURALITY BY LAYERS ARE DEPOSITED FOR COMBUSTION OF THE FUEL IN SAID COMPACTS AND THEN REMOVING ALL OF THE COMPACTS FROM SAID GRATE.
Claim 3
Dependent Claim
116 words
IN AN APPARATUS FOR BURNING ORE COMPACTS WHICH COMPRISES A CHAIN GRATE HAVING SIDE WALLS THEREALONG, A PLURALITY OF ROLLERS FOR SUPPORTING SAID CHAIN GRATE FOR A COURSE OF TRAVEL IN A GENERALLY HORIZONTAL PLANE, MEANS FOR ROTATING THE ROLLERS FOR MOVING THE GATE, MEANS FOR DEPOSITING LAYERS OF COMPACTS ON THE GRATE, AN IGNITER, AND WIND BOX MEANS UNDER SAID GRATE, THE IMPROVEMENT WHICH RESIDES IN MEANS FOR DEPOSITING VERTICAL WALL LAYERS OF GRANULAR MATERIAL LOGITUDINALLY ALONG THE OUTER EDGES OF THE GRATE ADJACENT THE INSIDE OF EACH OF THE SIDE WALLS THEREOF, MEANS FOR SIMULTANEOUSLY DEPOSITING ON THE GRATE OTHER GRANULAR MATERIAL IN THE SPACE SAID WALLS LAYERS AS SAID WALL LAYERS ARE DEPOSITED.
Claim 4
Dependent Claim
116 words
IN AN APPARATUS FOR BURNING ORE COMPACTS WHICH COMPRISES A CHAIN GRATE HAVING SIDE WALLS THEREALONG, A PLURALITY OF ROLLERS FOR SUPPORTING SAID CHAIN GRATE FOR A COURSE OF TRAVEL IN A GENERALLY HORIZONTAL PLANE, MEANS FOR ROTATING THE ROLLERS FOR MOVING THE GATE, MEANS FOR DEPOSITING LAYERS OF COMPACTS ON THE GRATE, AN IGNITER, AND WIND BOX MEANS UNDER SAID GRATE, THE IMPROVEMENT WHICH RESIDES IN MEANS FOR DEPOSITING VERTICAL WALL LAYERS OF GRANULAR MATERIAL LOGITUDINALLY ALONG THE OUTER EDGES OF THE GRATE ADJACENT THE INSIDE OF EACH OF THE SIDE WALLS THEREOF, MEANS FOR SIMULTANEOUSLY DEPOSITING ON THE GRATE OTHER GRANULAR MATERIAL IN THE SPACE SAID WALLS LAYERS AS SAID WALL LAYERS ARE DEPOSITED.
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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) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |