US PATENT SUBCLASS 106 / 772
.~.~ Calcium sulfate (e.g., gypsum, anhydrite, plaster of Paris, 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}
772.~.~ Calcium sulfate (e.g., gypsum, anhydrite, plaster of Paris, etc.) {10}
773  DF  .~.~.~> Soil, diatomaceous earth, clay, slate or shale, containing or material for treating soil or earth (e.g., soil stabilization, etc.) {1}
775  DF  .~.~.~> Anhydrous calcium sulfate (e.g., anhydrite, etc.) {2}
778  DF  .~.~.~> With organic material {2}
782  DF  .~.~.~> Slag, cinder, mica, talc, glass, boron or elemental carbon containing
783  DF  .~.~.~> Layered or coated material, nominal molding or shaping, or other physical process (e.g., steam, electrical, magnetic or wave energy, manipulative steps, etc.)
784  DF  .~.~.~> Particle size specified
785  DF  .~.~.~> Stabilizer, retarder, or setting agent specified
786  DF  .~.~.~> By-product gypsum (e.g., phosphogypsum, etc.)
787  DF  .~.~.~> Alum or halogen containing
788  DF  .~.~.~> Silica containing (e.g., sand, quartz, etc.)

DEFINITION

Classification: 106/772

Calcium sulfate (e.g., gypsum, anhydrite, plaster of paris, etc.):

(under subclass 638) Subject matter employing calcium sulfate, e.g., plaster of paris, anhydrite, gypsum, etc.

SEE OR SEARCH THIS CLASS, SUBCLASS:

765, for processes using calcium sulfate as a starting material in the making of Portland type cement.

SEE OR SEARCH CLASS

423, Chemistry of Inorganic Compounds,

555, for calcium sulfate, per se.

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 calcium sulfate cement, are classified herein. Residual apparatus for performing such processes is in Class 432.