Invalidity dossier
US 12152520
Urea pump, and control method and control system for urea pump
Current assignee: Weichai Power Co Ltd
Added 9/17/2026, 1:10:02 AM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview: US 12152520 B2
Title: Urea pump, and control method and control system for urea pump
Patent number: US 12152520 B2
Application number: US 18/276,919
Publication of application: US 20240125262 A1 (2024-04-18)
Grant/publication date: 2024-11-26
Filing date: 2022-12-29
Priority date (assumed): 2021-12-29
Anticipated expiration: 2042-12-29
Legal status: Active (as listed; the source notes this is an assumption, not a legal conclusion)
Assignee: Weichai Power Co., Ltd. (original and current assignee per the listed data; assignment recorded 2023-08-11)
Inventors: Lihua An; Weida Liu; Junpu Li; Guopeng Li
Purpose and plain-language scope: The patent relates to a urea pump used in exhaust aftertreatment, together with a method and system for controlling it. Urea (a NOx reducing agent) is dosed into engine exhaust as part of selective catalytic reduction (SCR), classified under F01N3/2066 and F01N3/208. The listed classifications also include control of SCR dosing, heating of the added substance and its control (F01N2610/105), supply arrangements and conduits (F01N2610/14), and storage tanks or reservoirs (F01N2610/1406). The "prior art keywords" listed are urea, pipeline, pump, filtering device, and urea pump, indicating the disclosure involves pumping urea through a pipeline and a filtering device. The excerpt does not describe the specific pump structure, the control steps, or the system architecture.
Source: https://patents.google.com/patent/US12152520/en
What the excerpt does not establish: It contains no claims, no detailed description, no abstract, and no drawing text. It therefore does not establish the actual claimed scope, the specific control method, embodiments, or the technical problem addressed. Dates and status are as listed by the source and are expressly presented there as assumptions rather than legal conclusions. No litigation, ownership-transfer history, validity, or prior-art findings are addressed here.
Generated 10/1/2026, 10:03:16 PM
Cases on file (0)
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Litigation summary
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Proceedings on file (0)
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No PTAB proceedings on file. This patent has not been challenged via IPR, PGR, or CBM. The absence is itself a signal — well-asserted patents eventually attract IPRs. The LLM analysis below may surface filings the ODP feed hasn’t indexed yet.
PTAB challenges
AIA trial proceedings at the USPTO Patent Trial and Appeal Board — IPR, PGR, and CBM. Petitioners, judge panels, claim-level invalidation outcomes from Final Written Decisions, and Federal Circuit appeals. The single most important defensive datapoint after litigation history.
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.
Prior art
Earlier patents, publications, and products that may anticipate or render the claims unpatentable.
Obviousness
Combinations of prior art that suggest the claimed invention would have been obvious under 35 U.S.C. § 103.
Extensions
Patent term adjustments, term extensions, continuations, divisionals, family members, and expiration dates.
Derivative works
Defensive disclosure: derivative variations of each claim designed to render future incremental improvements obvious or non-novel.