US PATENT SUBCLASS 106 / 777
.~.~.~.~ Keene's cement

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  DF  .~.~ Calcium sulfate (e.g., gypsum, anhydrite, plaster of Paris, etc.) {10}
775  DF  .~.~.~ Anhydrous calcium sulfate (e.g., anhydrite, etc.) {2}
777.~.~.~.~ Keene's cement

DEFINITION

Classification: 106/777

Keene's cement:

(under subclass 775) Subject matter employing Keene's cement.

(1) Note. When a patent refers to Keene's cement it is appropriate for this subclass. Commonly, Keene's cement is dead burned gypsum ground to a desired fineness.