> For the complete documentation index, see [llms.txt](https://doc.duaer.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.duaer.com/getting-started/patents.md).

# Search patents in Duaer

In Duaer, search patents via Europe PMC with Duaer Data. One successful search uses 1 credit. This page includes the full English call skill.
## What you get

Patents in the Duaer data market returns Europe PMC patent records (id, country, year, assignee). One successful search uses 1 credit.

Add the node from the [Duaer Data category](/getting-started/duaer-data.md) (Patents), or copy the skill on the [data market](/getting-started/data-market.md). Related: [Papers](/getting-started/papers.md).

## Search on the canvas

1. Open the node creator, select Duaer Data, then Patents.
2. Words is required (a new node starts with insulin).
3. Year from/to and Country are optional. Limit defaults to 10, max 20. Select Execute step.

A successful search uses 1 credit. Production deliverables land in the [data pool](/getting-started/data-pool.md).

## Call the API

- GET https://api.duaer.com/v1/data/patents?...
- Authorization: Bearer <Duaer key>
- words is required.

For keys, refer to [Authentication for the Duaer public API](/api/authentication.md). Below is the same English call skill as Copy skill.

## Call skill

Same text as Copy skill on the Duaer data market. Keep it English.

```
---
name: duaer-patents
description: >-
  Search patents through Duaer via Europe PMC.
  One successful search uses 1 Duaer credit.
---

# Duaer patents

Search patents through Duaer with a Duaer key (Europe PMC patent records).

## Call

`GET https://api.duaer.com/v1/data/patents?words=insulin&yearFrom=2010&yearTo=2020&country=US&limit=10`

Header: `Authorization: Bearer <Duaer key>`

Use an account key or a model API key.

`words` is required.

- `words` — words in the patent title or abstract.
- `yearFrom` / `yearTo` — optional. Publication year range (YYYY).
- `country` — optional. Country code on the patent id (`US`, `EP`, `WO`, …).
- `limit` — optional. From 1 to 20. Default 10.

## Result

Each item has `source`, `title`, `url`, `summary`, `patentId`, `country`, `typeCode`, `pubYear`, `applicationNumber`, `applicationDate`, `assignee`, and `authors`.
Related literature search: https://skills.duaer.com/papers.md.

## Credits

One successful search uses 1 credit.
An empty search, a failed search, a compound that matches nothing, or no remaining credits uses 0.
No remaining credits returns 402 and does not search.
A missing key returns 401.

```
## Questions

### What goes in Country for Duaer Patents?

A country code from the patent id prefix, such as US, EP, or WO.

## Related

- [Search papers in Duaer](https://doc.duaer.com/getting-started/papers.md)
- [Search compounds in Duaer](https://doc.duaer.com/getting-started/compounds.md)
- [Search assays in Duaer](https://doc.duaer.com/getting-started/assays.md)
- [Use the Duaer data market](https://doc.duaer.com/getting-started/data-market.md)