US PATENT SUBCLASS 514 / 176
.~.~.~ Nitrogen containing hetero ring

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

Internet Version by PATENTEC © 1999      Terms of Use


514 /   HD   DRUG, BIO-AFFECTING AND BODY TREATING COMPOSITIONS

1  DF  DESIGNATED ORGANIC ACTIVE INGREDIENT CONTAINING (DOAI) {29}
169  DF  .~ Cyclopentanohydrophenanthrene ring system DOAI {5}
172  DF  .~.~ Hetero ring containing {4}
176.~.~.~ Nitrogen containing hetero ring

DEFINITION

Classification: 514/176

Nitrogen containing hetero ring:

(under subclass 172) Subject matter wherein the hetero ring contains at least one nitrogen atom.