> ## Documentation Index > Fetch the complete documentation index at: https://docs.case.dev/llms.txt > Use this file to discover all available pages before exploring further. # Look up USPTO trademark status > Look up trademark status and details from the USPTO Trademark Status & Document Retrieval (TSDR) system. Supports lookup by serial number or registration number. Returns mark text, status, owner, goods/services, Nice classification, filing/registration dates, and more. ## OpenAPI ````yaml /openapi.json post /legal/v1/trademark-search openapi: 3.1.0 info: title: Case.dev API description: >- The AI-native platform for legal technology. Build smarter legal applications with our suite of AI-powered APIs. version: 1.0.0 contact: name: Case.dev Support email: support@casemark.com url: https://case.dev license: name: Proprietary url: https://case.dev/terms servers: - url: https://api.case.dev description: Production security: - bearerAuth: [] tags: - name: Vaults description: Secure document storage with semantic search and GraphRAG - name: Memory description: >- Persistent memory for AI agents with semantic search and 12 generic indexed tag fields - name: OCR description: Extract text from PDFs, images, and scanned documents - name: Voice description: Audio transcription and text-to-speech - name: LLMs description: Access 40+ language models through a unified API - name: Search description: Web search, AI answers, and deep research - name: Mail description: Managed inboxes for agent email workflows - name: Media description: Transcript retrieval and captioned media clip generation - name: Legal description: Legal research tools including citation verification - name: Privilege description: Privilege detection for e-discovery and litigation workflows - name: Compute description: Serverless GPU and CPU infrastructure - name: Format description: Document formatting and template rendering (MD/JSON to PDF/DOCX) - name: SuperDoc description: Document conversion and template automation - name: Webhooks description: Webhook endpoint management - name: System description: Public system metadata and discovery endpoints - name: Usage description: Usage reporting and webhook subscriptions - name: Database description: Serverless PostgreSQL databases with instant branching - name: Translation description: Language detection and translation for multilingual legal workflows - name: Skills description: Search and read legal AI skills for agents - name: Agents description: >- Create, manage, and execute AI agents with tool access, sandbox environments, and async run workflows - name: Matters description: Matter-native legal workspaces and orchestration primitives - name: Applications Projects description: Web application project management - name: Applications Deployments description: Web application deployment management - name: Applications Domains description: Custom domain configuration for applications - name: Applications Env Vars description: Environment variable management for applications paths: /legal/v1/trademark-search: post: tags: - Legal summary: Look up USPTO trademark status description: >- Look up trademark status and details from the USPTO Trademark Status & Document Retrieval (TSDR) system. Supports lookup by serial number or registration number. Returns mark text, status, owner, goods/services, Nice classification, filing/registration dates, and more. operationId: trademarkSearch requestBody: description: Trademark lookup parameters required: true content: application/json: schema: type: object properties: serialNumber: type: string description: >- USPTO serial number (e.g. "97123456"). Provide either serialNumber or registrationNumber. registrationNumber: type: string description: >- USPTO registration number (e.g. "6123456"). Provide either serialNumber or registrationNumber. responses: '200': description: Trademark lookup completed successfully content: application/json: schema: type: object properties: serialNumber: type: string description: USPTO serial number registrationNumber: type: string description: USPTO registration number (if registered) nullable: true markText: type: string description: The text of the trademark nullable: true markType: type: string description: >- Type of mark (e.g. "Standard Character Mark", "Design Mark") nullable: true status: type: string description: >- Current status (e.g. "Registered", "Pending", "Abandoned", "Cancelled") nullable: true statusDate: type: string format: date description: Date of most recent status update nullable: true filingDate: type: string format: date description: Date the application was filed nullable: true registrationDate: type: string format: date description: Date the mark was registered nullable: true owner: type: object description: Current owner/applicant information nullable: true properties: name: type: string nullable: true address: type: string nullable: true entityType: type: string nullable: true attorney: type: string description: Attorney of record nullable: true goodsAndServices: type: array description: Goods and services descriptions with class numbers items: type: object properties: classNumber: type: string nullable: true description: type: string nullable: true niceClasses: type: array items: type: integer description: Nice classification class numbers imageUrl: type: string description: URL to the mark image on USPTO CDN nullable: true usptoUrl: type: string description: Canonical TSDR link for this mark '400': description: Bad request - must provide serialNumber or registrationNumber '401': description: Unauthorized - invalid API key '403': description: Forbidden - insufficient permissions for Legal service '404': description: Trademark not found for the given number '500': description: Internal server error '502': description: Bad gateway - USPTO TSDR API returned an error '503': description: Service unavailable - trademark search service is not configured components: securitySchemes: bearerAuth: type: http scheme: bearer bearerFormat: API Key description: API key starting with `sk_case_` ````