US PATENT SUBCLASS 106 / 739
.~.~.~ Portland type cement per se (e.g., clinker preparation, etc.)

Current as of: June, 1999
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106 /   HD   COMPOSITIONS: COATING OR PLASTIC

*  DD  COATING OR PLASTIC COMPOSITIONS {40}
638  DF  .~ Inorganic settable ingredient containing {30}
713  DF  .~.~ Portland type cement {13}
739.~.~.~ Portland type cement per se (e.g., clinker preparation, etc.) {26}
740  DF  .~.~.~.~> Process involving spray drying, atomizing of solid material, steam, nonatmospheric pressure, cleaning step or avoiding contamination of equipment
741  DF  .~.~.~.~> Color control or modification (e.g., steps to produce white cement, etc.) {1}
743  DF  .~.~.~.~> Control of a parameter of operation in response to a measurement or test or to vary a result in a process
744  DF  .~.~.~.~> Employment of a fluidized bed
745  DF  .~.~.~.~> Waste material employed as raw material or fuel (not kiln dust)
746  DF  .~.~.~.~> Electrical, magnetic or wave energy employed (e.g., electric arc, etc.)
747  DF  .~.~.~.~> Use of heat transmitting or conducting solid material for cooling solid material from gas or for modifying temperature of solid material
748  DF  .~.~.~.~> Aftertreatment of clinker {2}
751  DF  .~.~.~.~> Involving kiln dust (e.g., recovery, treatment, processing thereof or product, etc.)
752  DF  .~.~.~.~> Treatment or removal of alkali, sulfurous or chloride impurities from raw material or fuel
753  DF  .~.~.~.~> Agglomerate, pellet, molded or shaped form of raw material {2}
756  DF  .~.~.~.~> Classifying, sorting, separating, screening, sizing, grading or subdividing solid material (e.g., centrifugal separation, flotation, etc.)
757  DF  .~.~.~.~> Comminuting or grinding, other than nominal, of raw material or fuel (e.g., to desired size or relative sizes, etc.) or recited particle of specified size
758  DF  .~.~.~.~> Raw material and fuel premixed or specified fuel
759  DF  .~.~.~.~> Flow of gases to produce turbulence (e.g., spiral, helical, Venturi, centrifugal, etc.)
760  DF  .~.~.~.~> Shape, angle, intensity or condition of fuel or flame specified (e.g., jet, oscillating, plural streams, spray, temperature, etc.)
761  DF  .~.~.~.~> Recycling exhaust gas, reusing heat from process, or purifying exhaust gas {1}
763  DF  .~.~.~.~> Ash containing raw material
764  DF  .~.~.~.~> Organic material or sea shell containing raw material
765  DF  .~.~.~.~> Calcium sulfate containing raw material
766  DF  .~.~.~.~> Phosphorus, boron, chromium, molybdenum, vanadium, or nickel containing raw material (P, B, Cr, Mo, V, Ni)
767  DF  .~.~.~.~> Slag containing raw material
768  DF  .~.~.~.~> Potassium, halogen or sulfur containing raw material (K, F, Cl, Br, I, S)
769  DF  .~.~.~.~> Iron or manganese containing raw material (Fe, Mn)
770  DF  .~.~.~.~> Slurry employed
771  DF  .~.~.~.~> Preprocessing or processing of raw material before firing (e.g., preheating, etc.)

DEFINITION

Classification: 106/739

Portland type cement, per se, (e.g., clinker preparation, etc.):

(under subclass 713) Subject matter involving portland type cement, per se, which is usually formed by sintering or calcining a mixture of calcareous and argillaceous materials to produce a sintered "clinker" which is subsequently ground to a finely divided state.

SEE OR SEARCH CLASS

34, Drying and Gas or Vapor Contact With Soilds, appropriate subclasses for processes of drying Portland type cement raw material and for processes of cooling Portland type cement clinker by solid and gas or vapor contact.

209, Classifying, Separating, and Assorting Solids, appropriate subclasses for the preliminary treatment of cement raw material by classifying, separating or assorting.

210, Liquid Purification or Separation, appropriate subclasses for filtration or other means of separation of liquid from cement raw material.

241, Solid Material Comminution or Disintegration,

1-, 30 for processes of comminuting solids, such as clinker, etc.

432, Heating, 1+, for methods of generating and applying heat to materials which do not undergo a chemical reaction during the heating.

Processes which involve "calcining", "dead-burning", "removing water of hydration", etc. are considered to involve a chemical reaction and, when applied to the manufacture of Portland type cement, are classified herein. Residual apparatus for performing such processes is in Class 432.