Patent Filings API

Retrieve USPTO granted patents mapped to stock tickers. Track patent grants, technology classifications (CPC), claim counts, inventors, and filing-to-grant timing for any covered company.

Endpoint

GET /v2/patent-filings/{symbol}

Authentication

The API supports multiple authentication methods:

Method	Example
Bearer token (recommended)	Authorization: Bearer YOUR_API_KEY
X-API-Key header	X-API-Key: YOUR_API_KEY
Query parameter	?apiKey=YOUR_API_KEY
Legacy query parameter	?token=YOUR_API_KEY

Parameters

Path Parameters

Parameter	Type	Required	Description
symbol	string	Yes	Stock ticker symbol (e.g., AAPL, NVDA)

Query Parameters

Parameter	Type	Required	Description
startDate	string	No	Start date for grant date (YYYY-MM-DD)
endDate	string	No	End date for grant date (YYYY-MM-DD)
limit	integer	No	Maximum number of results to return (1-500)

Request

Python (requests)

import requests

headers = {"Authorization": "Bearer YOUR_API_KEY"}

response = requests.get(
    "https://api.finbrain.tech/v2/patent-filings/AAPL",
    headers=headers,
    params={"limit": 10}
)
data = response.json()

for p in data["data"]["patents"]:
    print(f"{p['patentDate']}  {p['patentId']}  "
          f"[{p['primaryCpcSection']}]  {p['title']}")

cURL

curl -H "Authorization: Bearer YOUR_API_KEY" \
  "https://api.finbrain.tech/v2/patent-filings/AAPL"

C++

#include <iostream>
#include <string>
#include <curl/curl.h>
#include <nlohmann/json.hpp>

using json = nlohmann::json;

size_t WriteCallback(void* contents, size_t size, size_t nmemb, std::string* userp) {
    userp->append((char*)contents, size * nmemb);
    return size * nmemb;
}

json get_patent_filings(const std::string& symbol, const std::string& api_key) {
    CURL* curl = curl_easy_init();
    std::string response;

    if (curl) {
        std::string url = "https://api.finbrain.tech/v2/patent-filings/" + symbol;

        struct curl_slist* headers = nullptr;
        std::string auth_header = "Authorization: Bearer " + api_key;
        headers = curl_slist_append(headers, auth_header.c_str());

        curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallback);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &response);
        curl_easy_perform(curl);
        curl_slist_free_all(headers);
        curl_easy_cleanup(curl);
    }

    return json::parse(response);
}

int main() {
    auto result = get_patent_filings("AAPL", "YOUR_API_KEY");

    for (auto& p : result["data"]["patents"]) {
        std::cout << p["patentDate"].get<std::string>() << "  "
                  << p["patentId"].get<std::string>() << "  ["
                  << p["primaryCpcSection"].get<std::string>() << "]  "
                  << p["title"].get<std::string>()
                  << std::endl;
    }

    return 0;
}

Rust

use reqwest::blocking::Client;
use serde::Deserialize;
use std::error::Error;

#[derive(Debug, Deserialize)]
struct Patent {
    #[serde(rename = "patentId")]
    patent_id: String,
    #[serde(rename = "patentDate")]
    patent_date: String,
    title: String,
    #[serde(rename = "type")]
    patent_type: String,
    kind: String,
    #[serde(rename = "numClaims")]
    num_claims: i64,
    #[serde(rename = "numCitedBy")]
    num_cited_by: i64,
    #[serde(rename = "assigneeOrganization")]
    assignee_organization: String,
    #[serde(rename = "assigneeType")]
    assignee_type: String,
    #[serde(rename = "applicationFilingDate")]
    application_filing_date: String,
    #[serde(rename = "filingToGrantDays")]
    filing_to_grant_days: i64,
    inventors: Vec<String>,
    #[serde(rename = "numInventors")]
    num_inventors: i64,
    #[serde(rename = "cpcSections")]
    cpc_sections: Vec<String>,
    #[serde(rename = "cpcSubsections")]
    cpc_subsections: Vec<String>,
    #[serde(rename = "primaryCpcSection")]
    primary_cpc_section: String,
}

#[derive(Debug, Deserialize)]
struct PatentData {
    symbol: String,
    name: String,
    patents: Vec<Patent>,
}

#[derive(Debug, Deserialize)]
struct PatentResponse {
    success: bool,
    data: PatentData,
}

fn get_patent_filings(symbol: &str, api_key: &str)
    -> Result<PatentResponse, Box<dyn Error>> {
    let url = format!(
        "https://api.finbrain.tech/v2/patent-filings/{}",
        symbol
    );

    let client = Client::new();
    let response: PatentResponse = client
        .get(&url)
        .bearer_auth(api_key)
        .send()?
        .json()?;

    Ok(response)
}

fn main() -> Result<(), Box<dyn Error>> {
    let result = get_patent_filings("AAPL", "YOUR_API_KEY")?;

    for p in &result.data.patents {
        println!("{}  {}  [{}]  {}",
            p.patent_date, p.patent_id, p.primary_cpc_section, p.title);
    }

    Ok(())
}

JavaScript

const response = await fetch(
  "https://api.finbrain.tech/v2/patent-filings/AAPL",
  { headers: { "Authorization": "Bearer YOUR_API_KEY" } }
);
const result = await response.json();

for (const p of result.data.patents) {
  console.log(`${p.patentDate}  ${p.patentId}  [${p.primaryCpcSection}]  ${p.title}`);
}

Response

Success Response (200 OK)

{
  "success": true,
  "data": {
    "symbol": "AAPL",
    "name": "Apple Inc.",
    "patents": [
      {
        "patentId": "12345678",
        "patentDate": "2025-03-11",
        "title": "Method and apparatus for low-power display synchronization",
        "type": "utility",
        "kind": "B2",
        "numClaims": 20,
        "numCitedBy": 0,
        "assigneeOrganization": "Apple Inc.",
        "assigneeType": "2",
        "applicationFilingDate": "2022-06-15",
        "filingToGrantDays": 999,
        "inventors": ["John Doe", "Jane Smith"],
        "numInventors": 2,
        "cpcSections": ["G", "H"],
        "cpcSubsections": ["G06", "H04"],
        "primaryCpcSection": "G"
      }
    ]
  },
  "meta": {
    "timestamp": "2026-06-16T12:00:00.000Z"
  }
}

Response Fields

Field	Type	Description
success	boolean	Whether the request was successful
data.symbol	string	Stock ticker symbol
data.name	string	Company name
data.patents	array	Array of granted patent objects
meta.timestamp	string	Response timestamp (ISO 8601)

Patent Object Fields

Field	Type	Description
patentId	string	USPTO patent number (globally unique)
patentDate	string	Grant date (YYYY-MM-DD)
title	string	Patent title
type	string	Patent type (utility, design, plant, reissue)
kind	string	USPTO kind code (e.g., B2, S1)
numClaims	number	Number of claims in the patent
numCitedBy	number	Forward-citation count
assigneeOrganization	string	Organization the patent is assigned to
assigneeType	string	Assignee type code (2 = US company, 3 = foreign company)
applicationFilingDate	string	Original application filing date (YYYY-MM-DD)
filingToGrantDays	number	Days from filing to grant
inventors	array	Named inventors
numInventors	number	Number of inventors
cpcSections	array	CPC classification sections
cpcSubsections	array	CPC subsections
primaryCpcSection	string	Leading CPC section

Errors

Code	Error	Description
400	Bad Request	Invalid symbol or parameters
401	Unauthorized	Invalid or missing API key
403	Forbidden	Authenticated, but not authorized to access this resource
404	Not Found	Ticker not found
429	Too Many Requests	Rate limit exceeded — wait and retry
500	Internal Server Error	Server-side error

Related

• Patent Filings Dataset - Use cases and analysis examples
• Stock Screener API - Screen patent filings across tickers
• Government Contracts API - Federal contract awards
• Insider Transactions API - Insider trading data