US PATENT SUBCLASS 540 / 1
.~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS

Current as of: June, 1999
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540 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
1.~ 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}
2  DF  .~.~> Cyclopentanohydrophenanthrene ring system containing {10}
121  DF  .~.~> Azaporphyrins {1}
145  DF  .~.~> Porphyrins (including hydrogenated; e.g., chlorophyll, etc.)
200  DF  .~.~> Hetero ring is four-membered containing nitrogen and having chalcogen double bonded directly to a ring carbon which is adjacent to the ring nitrogen {7}
450  DF  .~.~> The hetero ring contains at least eight members including nitrogen and carbon {9}
484  DF  .~.~> The hetero ring contains seven members including nitrogen and carbon {14}

DEFINITION

Classification: 540/1

(under subclass 1) Compounds under Class 532, ... which are heterocyclic carbon compounds containing a hetero ring having chalcogen (i.e., oxygen, sulfur, selenium or tellurium) or nitrogen as the only ring hetero atoms.

(1) Note. An example of a compound provided for herein is: [figure]

SEE OR SEARCH CLASS

588, Hazardous or Toxic Waste Destruction or Containment, appropriate subclasses for the destruction of hazardous or toxic waste.