US PATENT SUBCLASS 208 / 171
.~.~.~ Uniform solids withdrawal


Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use



208 /   HD   MINERAL OILS: PROCESSES AND PRODUCTS

46  DF  CHEMICAL CONVERSION OF HYDROCARBONS {11}
146  DF  .~ Solids contacting and mixing {8}
165  DF  .~.~ Gravitating compact beds {7}
171.~.~.~ Uniform solids withdrawal


DEFINITION

Classification: 208/171

(under subclass 165) Processes including the step of removing the solids from the gravitating bed in such a manner that the solids are withdrawn uniformly over the horizontal cross-section of the bed.

(1) Note. The technique provided for in this subclass prevents a flow of solids at some point within the bed at a greater velocity than at other points as might be the case if solids are withdrawn from a single centrally located point and the adjacent solids fill the gap created. Such techniques as baffling the flow of solids withdrawn or providing multi-point withdrawal of solids prevent the nonuniform flow within the bed by providing a uniform withdrawal of solids.