US PATENT SUBCLASS 503 / 222
.~.~.~.~ Molecule having plural fluorans or more than three rings fused together

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

Internet Version by PATENTEC © 1999      Terms of Use


503 /   HD   RECORD RECEIVER HAVING PLURAL INTERACTIVE LEAVES OR A COLORLESS COLOR FORMER, METHOD OF USE, OR DEVELOPER THEREFOR

200  DF  HAVING A COLORLESS COLOR-FORMER, DEVELOPER THEREFOR, OR METHOD OF USE {16}
218  DF  .~ Identified color-former {4}
220  DF  .~.~ Furanone moiety-containing {1}
221  DF  .~.~.~ Fluoran or derivative {1}
222.~.~.~.~ Molecule having plural fluorans or more than three rings fused together

DEFINITION

Classification: 503/222

Molecule having plural fluorans or more than three rings fused together:

(under subclass 221) Subject matter in which the color former compound has in its molecule two or more fluoran moieties, or has a polycyclo ring system in which a ring shares two of its carbon atoms with one other ring, and two more of its carbons with second other ring.