Key facts
Contents & fields
The dataset contains 7 files supporting the paper's analysis. Files include: data on the evolution of the number of classes in the US Patent Classification System (1836-2015), and original (at grant) and current (2015) primary classification at the class level for patents granted between 1976 and 2015. No field-level description is publicly available on the source page.
Research uses
Suitable for research on patent classification evolution, technological change, and innovation economics.
Information comes from the source page. Please check that page for current details and terms.
Keywords
Access & license
License: License statement is still being checked | Free to access
Why this is hard to get on your own
When obtaining structured data on the long-run dynamics of patent classification, it is often extracted from paper supplements with incomplete field descriptions.