USPC Class Details

Description: 271 sheet feeding or delivering / 271 sheet feeding or delivering/(8.1) feeding (18) separators

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 271/18

Granted 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.
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