US PATENT SUBCLASS 544 / 63
.~.~.~ Six-membered hetero ring consists of oxygen, nitrogen and carbon (e.g., 1,2-oxazines, etc)

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

*  DD  ORGANIC COMPOUNDS (Class 532, subclass 1) {1}
*  DD  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1) {1}
1  DF  .~.~ Hetero ring is six-membered having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazines, etc.) {6}
63.~.~.~ Six-membered hetero ring consists of oxygen, nitrogen and carbon (e.g., 1,2-oxazines, etc) {8}
64  DF  .~.~.~.~> Heavy metal or aluminum containing
65  DF  .~.~.~.~> Plural oxygens in the six-membered hetero ring
66  DF  .~.~.~.~> Plural nitrogens in the six-membered hetero ring {2}
69  DF  .~.~.~.~> Boron or silicon containing
70  DF  .~.~.~.~> Spiro {1}
72  DF  .~.~.~.~> Plural oxazine rings {2}
88  DF  .~.~.~.~> 1,3-Oxazines {3}
98  DF  .~.~.~.~> 1,4-Oxazines {2}

DEFINITION

Classification: 544/63

(under subclass 1) Compounds in which the six-membered hetero ring consists of oxygen, nitrogen and carbon.

(1) Note. An oxazine ring in a polycyclo ring system is numbered as if it were a single ring and not part of a ring system: therefore, in each of the following: [figure] [figure] [caption]the oxazine ring is considered to be 1, 3-oxazine and classified accordingly.