US PATENT SUBCLASS 540 / 128
.~.~.~.~ Boron, germanium, phosphorus or silicon containing


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540 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
1  DF  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS {6}
121  DF  .~.~ Azaporphyrins {1}
122  DF  .~.~.~ Phthalocyanines {8}
128.~.~.~.~ Boron, germanium, phosphorus or silicon containing


DEFINITION

Classification: 540/128

(under subclass 122) Compounds which contain boron, germanium, phosphorus or silicon.