Overview of the NBER Patent Citations Data
These data are described in detail in NBER Working Paper No. XXXX, "The NBER Patent Citations Data File:  Lessons, Insights and Methodological Tools," by Bronwyn H. Hall, Adam B. Jaffe and Manuel Trajtenberg.

ALL USERS OF THESE DATA SHOULD READ THIS PAPER, AND SHOULD CITE IT AS THE SOURCE OF THE DATA

The data are in 5 zipped SAS "transport format" files as follows:

Cite75_99.zip contains the pairwise citations data.
Pat63_99.zip contains the patent data, including the constructed variables
Coname.zip contains the assignee names.
Match.zip contains the match to CUSIP numbers
Inventor.zip contains the individual inventor records

Each of these files has a corresponding "txt" file that contains the variable names and other documentation.

The files "List of classes.txt" and "List of countries.txt" contain, respectively, the patent class codes with corresponding class names, and the country codes with corresponding country names.