Identification of Substances from Claims Simplified in CAS PatentPak - UPDATE
Good news! Claim tags are now available back to 1984 for US patents, and will be extended back to 1975 in the weeks to come.
For CN patents, the backfile now extends back to 2013, and is complete.
Originally, claim tags were available only from 2020 to present, for both US and CN, in H/Z/CAplus.
Watch this space for news about the next authority which will include Claim Tags.