Hierarchy/Derived subclasses
D28 / 4 | -> 5 | -> 1 | -> 6 | |
-> 7 | -> 2 | -> 8 | -> 13 | |
-> 8.1 | -> 8.2 |
uspto searches
Patent Apps in D28/4Granted Patents in D28/4
Use the links above or do an advanced search in ppubs for:
(D28/4.ccls. or D28/5.ccls. or D28/1.ccls. or D28/6.ccls. or D28/7.ccls. or D28/2.ccls. or D28/8.ccls. or D28/13.ccls. or D28/8.1.ccls. or D28/8.2.ccls.)
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.