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Home   •   Our Expertise  •  CAS Databases  •  CAplus  •  Patent Coverage in CA

Patent Coverage in Chemical Abstracts

CAS covers patents from patent offices around the world.  Patent records, meeting CAS selection criteria, from 9 of the major patent offices worldwide are available online in CAplus within 2 days of the patents' issuance, and full indexed by CAS scientists in less than 27 days from the date of issue.

Patents are selected from over 23,000 International Patent Classification (IPC) codes and U.S. National Patent Classification Codes. Coverage is described in the following lists:

• IPC Reform I for Guaranteed Coverage - new 1/06
• IPC Reform II for Selective Coverage - new 1/06
• Country Code and Year List for Patent Countries Covered - updated 7/07
• Kind Code List for Patents Covered - updated 7/07
• Changes to CAS Patent Kind Codes - new 12/06
• IPC7 List I for Guaranteed Coverage - updated 7/00
• IPC7 List II for Selective Coverage - updated 7/00
• US National Patent Classifications