To find patents with many or few unique terms in claim 1 (the first claim), use the ANA_FCLM_UW field code.

The ANA_FCLM_UW field code is another view of claim 1 similar to the ANA_FCLM_TW code.  The difference is that the ANA_FCLM_TW is a count of the total words in the claim.  In contrast, ANA_FCLM_UW counts each unique word in the claim only one time.  In other words, if someone wrote the claim "Buffalo and buffalo buffalo buffalo," ANA_FCLM_TW would return a count of 5 and ANA_FCLM_UW would return a count of 2 (one for the word "buffalo," no matter how many times it's written, and one for the word "and").