# USPTO Patent Assignment Search API

**Canonical:** https://apis.io/apis/uspto/assignment-search-api/  
**Provider:** USPTO — https://apis.io/providers/uspto/  
**Documentation:** https://developer.uspto.gov/api-catalog

USPTO Patent Assignment Search API is one of 5 APIs that [USPTO](https://apis.io/providers/uspto/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Assignments, Government, Patents, and Regulatory. The published artifact set on APIs.io includes API documentation.

The USPTO Patent Assignment Search API retrieves patent assignment information including ownership transfers, recorded assignments, and assignment history for individual patents and patent portfolios.

## Machine-readable artifacts (2)

- **Documentation** — https://developer.uspto.gov/api-catalog
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/uspto/refs/heads/main/apis.yml

## Other USPTO APIs (4)

- [USPTO Assignments API](https://apis.io/apis/uspto/uspto-assignments-api/)
- [USPTO Patents API](https://apis.io/apis/uspto/uspto-patents-api/)
- [USPTO PTAB API](https://apis.io/apis/uspto/uspto-ptab-api/)
- [USPTO Trademarks API](https://apis.io/apis/uspto/uspto-trademarks-api/)

## Tags

Assignments, Government, Patents, Regulatory

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/uspto/assignment-search-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/uspto/.