Hierarchy/Derived subclasses
271 / 8.1 | -> 18 | -> 18.1 | -> 18.2 | ||
-> 18.3 | -> s | ||||
-> 19 | -> 20 | ||||
-> 21 | -> 22 | ||||
-> 23 | |||||
-> 24 | -> 25 | ||||
-> 90 | -> 91 | -> 92 | |||
-> 93 | |||||
-> 94 | -> 95 | ||||
-> 96 | |||||
-> 97 | -> 98 | ||||
-> 99 | -> 100 | -> 101 | |||
-> 102 | |||||
-> 103 | |||||
-> 104 | |||||
-> 105 | -> 106 | ||||
-> 107 | |||||
-> 108 | |||||
-> 30.1 | -> 31 | ||||
-> 31.1 | |||||
-> 33 | |||||
-> 34 | -> 35 | ||||
-> 109 | -> 37 | -> 38 | |||
-> 110 | -> 111 | ||||
-> 112 | |||||
-> 113 | |||||
-> 114 | -> 115 | ||||
-> 116 | |||||
-> 117 | -> 118 | ||||
-> 119 | -> 120 | ||||
-> 121 | -> 122 | ||||
-> 123 | |||||
-> 124 | -> 125 | ||||
-> 126 | -> 127 | ||||
-> 42 | -> 128 | -> 129 | |||
-> 130 | |||||
-> 131 | -> 132 | ||||
-> 133 | -> 134 | ||||
-> 135 | |||||
-> 136 | |||||
-> 137 | -> 138 | ||||
-> 139 | -> 140 | ||||
-> 141 | |||||
-> 142 | |||||
-> 143 | |||||
-> 144 |
uspto searches
Patent Apps in 271/18Granted Patents in 271/18
Use the links above or do an advanced search in ppubs for:
(271/18.ccls. or 271/18.1.ccls. or 271/18.2.ccls. or 271/18.3.ccls. or 271/s.ccls. or 271/19.ccls. or 271/20.ccls. or 271/21.ccls. or 271/22.ccls. or 271/23.ccls. or 271/24.ccls. or 271/25.ccls. or 271/90.ccls. or 271/91.ccls. or 271/92.ccls. or 271/93.ccls. or 271/94.ccls. or 271/95.ccls. or 271/96.ccls. or 271/97.ccls. or 271/98.ccls. or 271/99.ccls. or 271/100.ccls. or 271/101.ccls. or 271/102.ccls. or 271/103.ccls. or 271/104.ccls. or 271/105.ccls. or 271/106.ccls. or 271/107.ccls. or 271/108.ccls. or 271/30.1.ccls. or 271/31.ccls. or 271/31.1.ccls. or 271/33.ccls. or 271/34.ccls. or 271/35.ccls. or 271/109.ccls. or 271/37.ccls. or 271/38.ccls. or 271/110.ccls. or 271/111.ccls. or 271/112.ccls. or 271/113.ccls. or 271/114.ccls. or 271/115.ccls. or 271/116.ccls. or 271/117.ccls. or 271/118.ccls. or 271/119.ccls. or 271/120.ccls. or 271/121.ccls. or 271/122.ccls. or 271/123.ccls. or 271/124.ccls. or 271/125.ccls. or 271/126.ccls. or 271/127.ccls. or 271/42.ccls. or 271/128.ccls. or 271/129.ccls. or 271/130.ccls. or 271/131.ccls. or 271/132.ccls. or 271/133.ccls. or 271/134.ccls. or 271/135.ccls. or 271/136.ccls. or 271/137.ccls. or 271/138.ccls. or 271/139.ccls. or 271/140.ccls. or 271/141.ccls. or 271/142.ccls. or 271/143.ccls. or 271/144.ccls.)
At about 35 search terms the uspto will give you this error "Too many search terms" The 35th term is bold.
This will show what classes derive from the input. Ex: entering 43/42.24 shows the derived classes and the search that can be used to find patents or patent applications in those subclasses.