Hierarchy/Derived subclasses
| 331 / 1r | -> 2 | ||
| -> 3 | |||
| -> 4 | |||
| -> 5 | |||
| -> 6 | -> 7 | ||
| -> 8 | |||
| -> 9 | |||
| -> 10 | -> 11 | -> 12 | |
| -> 13 | |||
| -> 14 | |||
| -> 15 | |||
| -> 16 | |||
| -> 17 | |||
| -> 18 | -> 19 | ||
| -> 20 | -> 21 | ||
| -> 22 | |||
| -> 23 | -> 24 | ||
| -> 25 | -> 26 | ||
| -> 27 | |||
| -> 28 | |||
| -> 29 | |||
| -> 30 | -> 31 | ||
| -> 32 | -> 33 | ||
| -> 34 | -> 35 | ||
| -> 36r | -> 36c | ||
| -> 36l | |||
| -> 1a |
uspto searches
Patent Apps in 331/1rGranted Patents in 331/1r
Use the links above or do an advanced search in ppubs for:
(331/1r.ccls. or 331/2.ccls. or 331/3.ccls. or 331/4.ccls. or 331/5.ccls. or 331/6.ccls. or 331/7.ccls. or 331/8.ccls. or 331/9.ccls. or 331/10.ccls. or 331/11.ccls. or 331/12.ccls. or 331/13.ccls. or 331/14.ccls. or 331/15.ccls. or 331/16.ccls. or 331/17.ccls. or 331/18.ccls. or 331/19.ccls. or 331/20.ccls. or 331/21.ccls. or 331/22.ccls. or 331/23.ccls. or 331/24.ccls. or 331/25.ccls. or 331/26.ccls. or 331/27.ccls. or 331/28.ccls. or 331/29.ccls. or 331/30.ccls. or 331/31.ccls. or 331/32.ccls. or 331/33.ccls. or 331/34.ccls. or 331/35.ccls. or 331/36r.ccls. or 331/36c.ccls. or 331/36l.ccls. or 331/1a.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.