Pat63_99 File ------------- Source: USPTO, and Jaffe and Trajtenberg computations. The Pat63_99 file includes all utility patents in the USPTO's TAF database granted during the period 1963 to December 1999. Classification information reflects the U.S. Patent Classification System as of December 31, 1999. No. of observations: 2,923,922 USPTO Original Variables: ------------------------- Variable Name Variable type Characters Contents patent numeric 7 Patent Number gyear numeric 12 Grant Year gdate numeric 12 Grant Date appyear numeric 12 Application Year country character 3 Country of First Inventor postate charecter 3 State of First Inventor (if US) assignee numeric 12 Assignee Identifier (missing 1963-1967) asscode numeric 12 Assignee Type (see below) claims numeric 12 number of Claims nclass numeric 12 Main Patent Class (3 digit) New Variables: --------------------- Variable Name Variable type Characters Contents cat numeric 12 Technological Category subcat numeric 12 Technological Sub-Category cmade numeric 12 Number of Citations Made creceive numeric 12 Number of Citations Received ratiocit numeric 6 Percent of Citations Made to Patents Granted Since 1963 general numeric 6 Measure of Generality original numeric 6 Measure of Originality fwdaplag numeric 7 Mean Forward Citation Lag bckgtlag numeric 8 Mean Backward Citation Lag selfctub numeric 6 Share of Self-Citations Made - Upper Bound selfctlb numeric 6 Share of Self-Citations Made - Lower Bound secdupbd numeric 6 Share of Self-Citations Received - Upper Bound secdlwbd numeric 6 Share of Self-Citations Received - Lower Bound The Pat63_99 file is sorted by ascending patent number. About The Variables: -------------------- 1. The State/Country Code is a three-character code. A list of corresponding state and country names is included in the list_countries file. These codes are present for all patents in the file (1963-1999). 2. The Assignee Identifier can be converted to the company name using the Coname file, Assignee Identifier is available for patents granted since 1969. 3. The Assignee type code is a one-character code having the following meaning: 1 = unassigned 2 = assigned to a U.S. nongovernment organization 3 = assigned to a non-U.S., nongovernment organization 4 = assigned to a U.S. individual 5 = assigned to a non-U.S. individual 6 = assigned to the U.S. (Federal) Government 7 = assigned to a non-U.S. government 8,9 = assigned to a U.S. non-Federal Government agency (do not appear in the dataset) 4. The upper and lower bound for self-citations, together with the number of citations received, allow to compute the number of citations received having an assignee identifier (same for citations made). 5. The application year is available for patents granted since 1967. 6. The number of claims is available for patents granted since 1975. 7. Grant Date is the number of days elapsed since 1.1.1960. 8. Main Patent Class list, as provided by the USPTO, is given in the attached Class file.