Fluidized bed process
Patent 3998929 Issued on December 21, 1976. Estimated Expiration Date: 
December 21, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 21, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2639132 2801900 3139726 3266788 3316334 3645513 3758266 3796791 3872211 InventorAssigneeApplicationNo. 302078 filed on 10/30/1972US Classes:423/157.2, Phosphate rock or ore422/143, Including specific wind box or particulate matter support grid432/15, Including maintenance of fluidized bed432/58, WITH HEATING GAS CONVEYING, AGITATING, SCATTERING OR DISINTEGRATION OF WORK (E.G., FLUIDIZED BED, ETC.)432/77WITH WORK COOLING STRUCTUREExaminersPrimary: Carter, Herbert T.Assistant: Wheelock, Eugene T. Attorney, Agent or FirmAbstractHot gases for fluidizing the preheat compartment of a multi-bed fluid bed reactor are cooled by injection of water, or cool air and water, to reduce scaling of the ducts, hot cyclone, hot windbox and the tuyeres in the constriction dome separating the hot windbox from the preheat compartment.Other References
Field of SearchSulfatingMixing fuel with starting mixture Calcining gypsum With steam or at specified temperature Treating impure carbonate (e.g., oyster shells, etc.) Calcining Utilizing vacuum or steam With agitating or at specified temperature Ternary compound containing hydrogen Orthophosphoric acid Utilizing reactant containing silicon or carbon Reacting an acid and phosphate rock Sulfuric acid TREATING MIXTURE TO OBTAIN METAL CONTAINING COMPOUND |
| ||||||||||||||
