PATENTS   
Patents > Guidance, Tools, and Manuals > Classification > Class Schedule
    Class Numbers & Titles   | Class Numbers Only   | USPC Index   | International   | HELP  
You are viewing a USPC Schedule.
[Search a list of Patent Appplications for class 540]  Class   540ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES
Click here for a printable version of this file
  Turn Outline  
     Expand/Contract Processing Please Wait
This Class 540 is considered to be an integral part of Class 260 (see the Class 260 schedule for the position of this Class in schedule hierarchy). This Class retains all pertinent definitions and class lines of Class 260.
                ORGANIC COMPOUNDS (CLASS 532, SUBCLASS 1)
   [List of Patents for class 540 subclass 1]  1           Subclass 1 indent level is 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
   [List of Patents for class 540 subclass 2]  2           Subclass 2 indent level is 2 Cyclopentanohydrophenanthrene ring system containing
    [List of Patents for class 540 subclass 3]  3           Subclass 3 indent level is 3 Heavy metal or aluminum containing
    [List of Patents for class 540 subclass 4]  4           Subclass 4 indent level is 3 Boron or silicon containing
    [List of Patents for class 540 subclass 5]  5           Subclass 5 indent level is 3 Phosphorus attached directly or indirectly to the cyclopentanohydrophenanthrene ring system by nonionic bonding
   [List of Patents for class 540 subclass 6]  6           Subclass 6 indent level is 3 Spiro
   [List of Patents for class 540 subclass 7]  7           Subclass 7 indent level is 4 Plural spiro atoms
   [List of Patents for class 540 subclass 15]  15           Subclass 15 indent level is 4 The cyclopentanohydrophenanthrene ring system is part of a polycyclo ring system having at least five cyclos
   [List of Patents for class 540 subclass 16]  16           Subclass 16 indent level is 5 Hetero ring is one of the cyclos of the polycyclo ring system
   [List of Patents for class 540 subclass 17]  17           Subclass 17 indent level is 6 The hetero ring is five-membered, consisting of one oxygen and four carbons, and shares the spiro atom with a six-membered oxygen containing hetero ring (e.g., sapogenins, etc.)
    [List of Patents for class 540 subclass 23]  23           Subclass 23 indent level is 6 The spiro atom is the 17-position carbon of the cyclopentanohydrophenanthrene ring system
    [List of Patents for class 540 subclass 24]  24           Subclass 24 indent level is 6 The hetero ring shares the 11,12,13-positions of the cyclopentanohydrophenanthrene ring system (i.e., bridged; e.g., 11,18-oxido steroids, etc.)
   [List of Patents for class 540 subclass 25]  25           Subclass 25 indent level is 6 The hetero ring is three-membered consisting of one oxygen and two carbons (e.g., oxirane, etc.)
    [List of Patents for class 540 subclass 27]  27           Subclass 27 indent level is 6 The hetero ring contains two chalcogens which are bonded directly at the 16 and 17-positions of the cyclopentanohydrophenanthrene ring system
   [List of Patents for class 540 subclass 28]  28           Subclass 28 indent level is 4 The spiro includes the cyclopentanohydrophenanthrene ring system and a hetero ring
    [List of Patents for class 540 subclass 29]  29           Subclass 29 indent level is 5 Nitrogen in the spiro hetero ring
    [List of Patents for class 540 subclass 30]  30           Subclass 30 indent level is 5 Sulfur in the spiro hetero ring
   [List of Patents for class 540 subclass 31]  31           Subclass 31 indent level is 5 Plural oxygens in the spiro hetero ring
   [List of Patents for class 540 subclass 41]  41           Subclass 41 indent level is 5 The spiro hetero ring contains -C(=X)-O-, wherein X is chalcogen, as part of the ring (e.g., spiro-lactones, etc.)
    [List of Patents for class 540 subclass 45]  45           Subclass 45 indent level is 5 The spiro hetero ring is four-membered consisting of one oxygen and three carbons
    [List of Patents for class 540 subclass 46]  46           Subclass 46 indent level is 5 The spiro hetero ring is three-membered consisting of one oxygen and two carbons (e.g., oxirane, etc.)
   [List of Patents for class 540 subclass 47]  47           Subclass 47 indent level is 3 The cyclopentanohydrophenanthrene ring system is part of a polycyclo ring system having at least five cyclos
   [List of Patents for class 540 subclass 48]  48           Subclass 48 indent level is 4 Hetero ring is one of the cyclos of the polycyclo ring system
   [List of Patents for class 540 subclass 49]  49           Subclass 49 indent level is 5 The hetero ring contains nitrogen
    [List of Patents for class 540 subclass 59]  59           Subclass 59 indent level is 5 The hetero ring contains sulfur
    [List of Patents for class 540 subclass 60]  60           Subclass 60 indent level is 5 The hetero ring is a cyclic anhydride (i.e., containing -C(=X)-O-C(=Y)- as part of the ring, wherein X and Y are chalcogen; e.g., 5,8-maleic anhydride adduct of 5,7,9(11)-pregnatrien-3,20-di-one, etc.)
   [List of Patents for class 540 subclass 61]  61           Subclass 61 indent level is 5 The hetero ring contains plural oxygens
   [List of Patents for class 540 subclass 72]  72           Subclass 72 indent level is 5 The hetero ring is a lactone (i.e., containing -C(=X)-O- as part of the ring, wherein X is chalcogen)
   [List of Patents for class 540 subclass 76]  76           Subclass 76 indent level is 5 The hetero ring is three-membered consisting of one oxygen and two carbons (e.g., oxirane, etc.)
   [List of Patents for class 540 subclass 90]  90           Subclass 90 indent level is 5 The hetero ring shares at least three ring members with one other cyclo of the polycyclo ring system (i.e., bridged)
    [List of Patents for class 540 subclass 93]  93           Subclass 93 indent level is 5 The hetero ring shares a ring carbon with two other cyclos of the polycyclo ring system (e.g., peri-fused, etc.)
   [List of Patents for class 540 subclass 94]  94           Subclass 94 indent level is 3 Hetero ring attached directly to the cyclopentanohydrophenanthrene ring system by nonionic bonding