USPTO Assignments¶

Access patent ownership transfer history via the USPTO Assignment Center. No API key required.

Quick Start¶

from patent_client_agents.uspto_assignments import AssignmentCenterClient

async with AssignmentCenterClient() as client:
    # By assignee company
    records = await client.search_by_assignee("[Company Name]")
    for r in records:
        print(f"{r.reel_frame}: {r.assignor_name} -> {r.assignee_name}")

    # By specific patent
    history = await client.search_by_patent("10123456")

    # By application number
    app_records = await client.search_by_application("16123456")

Configuration¶

No credentials required. Rate limit is unpublished — the client's hishel cache + default_retryer handle transient throttling.

Client¶

AssignmentCenterClient inherits from law_tools_core.BaseAsyncClient.

Functions¶

Function	Description
`search(**kwargs)`	General search by any field
`search_by_assignee(name)`	Company/person acquiring rights
`search_by_assignor(name)`	Company/person transferring rights
`search_by_patent(patent_number)`	Chain of title for a patent
`search_by_application(application_number)`	Chain of title for an app
`search_by_reel_frame(reel_frame)`	Direct record lookup (e.g. `52614/446`)
`search_all(**kwargs)`	Paginated full-result iterator

Result shape¶

class AssignmentRecord(BaseModel):
    reel_frame: str
    recording_date: date | None
    conveyance_type: str
    assignor_name: str
    assignee_name: str
    assignee_address: str | None
    properties: list[AssignmentProperty]  # patents/applications transferred

Usage patterns¶

from patent_client_agents.uspto_assignments import AssignmentCenterClient

async with AssignmentCenterClient() as client:
    # Paginate for large result sets
    all_records = await client.search_all(assignee_name="[Company Name]")
    print(f"found {len(all_records)} assignments")

Error handling¶

Inherits typed exceptions from law_tools_core: NotFoundError, ApiError. No auth errors (public endpoint).