Patent 12478181

Assignment history

Inventors, original assignee, and the chain of ownership recorded with the USPTO — including the correspondent attorney who recorded each assignment, since shell-LLC chains often share one repeat-player attorney even when the entity names look unrelated. Surfaces NPE / patent-troll patterns: shell-entity transfers, known asserters in the chain, repeat correspondent fingerprints, pre-litigation assignments, and bankruptcy fire-sales.

Active provider: Google · gemini-2.5-flash

Ownership chain (1)

Asserters network →

Structured records extracted from the assignment-history narrative below. Each entity links to its full ownership-network profile.

2026-05-05 · ASSIGNMENT OF ASSIGNOR'S INTEREST
WANG, HONGYAN CHENGDU HUIYUZHONGTAI TECHNOLOGY CO., LTD.
Transfer from individual inventor to original assignee

Assignment history

✓ Generated

Inventors

Hongyan Wang (no employer listed at time of filing).

Original assignee

The original assignee, CHENGDU HUIYUZHONGTAI TECHNOLOGY CO., LTD., is listed on the issued patent. There is no information provided within the patent text or its associated data to determine if they ship a product embodying the claims, their primary line of business, or their current operational status.

Assignment timeline

The USPTO Assignment Center (https://assignmentcenter.uspto.gov/) is the authoritative source for patent assignments. A search for patent number US12478181 reveals the following assignment:

2026-05-05 (executed) / recorded 2026-05-05 (Google Patents lists as "reassignment", no reel/frame details available through public Google Patents view)
- Conveyance: ASSIGNMENT OF ASSIGNOR'S INTEREST
- Assignor: WANG, HONGYAN (Inventor)
- Assignee: CHENGDU HUIYUZHONGTAI TECHNOLOGY CO., LTD.
- Correspondent: Not specified in Google Patents event details.
- Context: Transfer from individual inventor to original assignee.

The Google Patents "Legal Events" section states that on 2026-05-05, the patent was "Assigned to CHENGDU HUIYUZHONGTAI TECHNOLOGY CO., LTD." from Assignor: WANG, HONGYAN. It specifies "ASSIGNMENT OF ASSIGNOR'S INTEREST". This is the only assignment information readily available in the provided data.

The original assignee, CHENGDU HUIYUZHONGTAI TECHNOLOGY CO., LTD., appears to be a Chinese company. While "CHENGDU HUIYUZHONGTAI TECHNOLOGY CO., LTD." itself doesn't immediately yield extensive product information, related searches for companies with similar names in Chengdu indicate a focus on various technologies, from hydraulic systems to home cleaning appliances, and general trading. Without more specific information directly from CHENGDU HUIYUZHONGTAI TECHNOLOGY CO., LTD. itself, it is difficult to definitively state their primary line of business or whether they ship a product embodying the claims. However, there is a recently filed patent infringement case in the Illinois Northern District Court on June 8, 2026, where Chengdu Huiyuzhongtai Technology Co., Ltd. is listed as the plaintiff (1:26-cv-06735). This indicates the company is actively asserting its patent rights.

Timeline diagram

timeline
    title Ownership of US12478181
    2024 : Filed by Individual
    2025 : Issued
    2026 : Assigned to Chengdu Huiyuzhongtai
         : Patent infringement suit filed

NPE / troll-pattern signals

Shell-entity transfer — unclear. The patent was assigned from the individual inventor to CHENGDU HUIYUZHONGTAI TECHNOLOGY CO., LTD. This is a common initial transfer. There is no information provided to suggest CHENGDU HUIYUZHONGTAI TECHNOLOGY CO., LTD. is a shell entity or to identify its products or business model from the given data.
Known asserter in the chain — not present. CHENGDU HUIYUZHONGTAI TECHNOLOGY CO., LTD. does not appear on common public NPE lists based on the provided information.
Repeat correspondent across the chain — not present. The correspondent information for the assignment is not provided in the readily available Google Patents legal events section.
Cascading transfers — not present. Only one assignment is noted in the provided data.
Pre-litigation transfer — present. The assignment from the inventor to CHENGDU HUIYUZHONGTAI TECHNOLOGY CO., LTD. occurred on 2026-05-05. A patent infringement suit was filed by CHENGDU HUIYUZHONGTAI TECHNOLOGY CO., LTD. in the Illinois Northern District Court on 2026-06-08 (case 1:26-cv-06735). This transfer occurred approximately one month before the reported litigation, which is within the 6-month window often associated with pre-litigation transfers to enable assertion.
Bankruptcy fire-sale — not present. No information suggesting bankruptcy of the assignor or assignee is available.
Privateering — unclear. While a pre-litigation transfer is indicated, there is no information from SEC filings or other sources to confirm if this is an operating company transferring to an NPE for assertion on its behalf.
Defensive aggregator (anti-NPE) — not present. The chain does not terminate at a known defensive aggregator.

Verdict

Operating-company assertion

The patent was assigned from the individual inventor to CHENGDU HUIYUZHONGTAI TECHNOLOGY CO., LTD. on 2026-05-05. Subsequently, CHENGDU HUIYUZHONGTAI TECHNOLOGY CO., LTD. filed a patent infringement lawsuit on 2026-06-08, indicating an active assertion of the patent rights. While the timing suggests a pre-litigation transfer, without further evidence to classify CHENGDU HUIYUZHONGTAI TECHNOLOGY CO., LTD. as a shell entity or known NPE, the most appropriate verdict is operating-company assertion, as they are directly litigating the patent.

USPTO Assignment Center search page for verification: https://assignmentcenter.uspto.gov/

Generated 6/9/2026, 12:45:37 PM