Classification Tree / Range search
Classification tree search allows you to automatically search for the children (dependent classes) of any full IPC, CPC, US or FI classes.
The search syntax character for this is $ (“dollar”) and you can add that at the end of a “full class”. In case of IPC the full class would be the Main Group with /00 (E.g. C01L1/00) or Subgroup (E.g C01L1/195).
For example:

IC:C01G21/06 only searches for this class.
IC: C01G21/06$ will also search for C01G21/08, C01G21/10, C01G21/12, C01G21/14, C01G21/16, C01G21/18, C01G21/20, C01G21/22, C01G21/24, C01G21/26, C01G21/27 in addition to the C01G21/06.
Similarly, if you search for C01G21/00$ it will also search all the 16 classes under this.
UC:71/31 only searches for this class.
UC:71/31$ will also search for 32 classes that are dependent on this.
UC:71/64.01$ also searches for 12 classes that are dependent on this.
Important Note: The $ is only supported at the end of a full class and should not be used as a replacement for a wildcard. You cannot use C01L$ or C01$ or C01L1$. You will have to continue to use the wildcard character * for it.
The classification tree search is supported for CPC, IPC, US and FI classes.