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.
This card was drafted from the source page; institution, coverage, time span, scale, fields and license are subject to the official page (pending human review).
Keywords
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.