US PATENT SUBCLASS 552 / 544
.~.~.~ Exactly one oxygen bonded directly to the cyclopentanohydrophenanthrene ring system (e.g., cholesterols, cholestanols, stigmasterols, etc.)

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

*  DD  ORGANIC COMPOUNDS (Class 532, subclass 1) {11}
502  DF  .~ Cyclopentanohydrophenanthrene ring system containing {21}
540  DF  .~.~ Carbon bonded directly at the 17 beta-position of the cyclopentanohydrophenanthrene ring system is a member of an acyclic chain of six or more uninterrupted carbons (e.g., sterols, etc.) {4}
544.~.~.~ Exactly one oxygen bonded directly to the cyclopentanohydrophenanthrene ring system (e.g., cholesterols, cholestanols, stigmasterols, etc.) {3}
545  DF  .~.~.~.~> Processes of isolating, purifying or recovering from animal, vegetable or fungal sources (e.g., wool fat or grease, lanolin, fish oils, animal tissue, soybean oil, tall oil or pitch, wood products, sugar cane, soap stocks, yeast, molds, etc.)
546  DF  .~.~.~.~> Halogen or oxygen bonded directly to the acyclic carbon chain at the 17 beta-position (e.g., 25-hydroxy cholesterols, etc.)
547  DF  .~.~.~.~> Unsaturation between the 7- and 8-positions (e.g., ergosterols, 7 dehydrocholesterols, provitamin D, etc.)

DEFINITION

Classification: 552/544

(under subclass 540) Compounds in which exactly one oxygen is bonded directly to the cyclopentanohydrophenanthrene ring system.

(1) Note. Lanolin is provided for in this subclass.

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