Invalidity dossier
US 9211874
Brake system having simultaneous or partially simultaneous pressure generation and reduction in the wheel brakes from differing wheel cylinder pressure levels
Current assignee: Ipgate AG
Added 9/23/2026, 11:26:06 PM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US9211874B2
Title: "Brake system having simultaneous or partially simultaneous pressure generation and reduction in the wheel brakes from differing wheel cylinder pressure levels"
Patent number: US9211874B2
Assignee: Ipgate AG (original and current assignee per the source listing, which notes assignee data may be inaccurate and reflects no legal analysis)
Inventors: Heinz Leiber, Anton V. Zanten, Christian Koglsperger
Key dates (as stated in the source):
- Priority date: 2009-02-13 (stated as an assumption, not a legal conclusion)
- Filing date: 2010-02-13
- Publication of application US20120013173A1: 2012-01-19
- Grant/publication of US9211874B2: 2015-12-15
- Adjusted expiration: 2030-07-08
Application number: US13/145,854
Purpose and plain-language scope: The invention concerns a vehicle brake system in which pressure can be generated and reduced — simultaneously or only partially simultaneously — across wheel brakes, starting from differing wheel cylinder pressure levels. In other words, the system can raise pressure at some wheels while lowering it at others, even when those wheels begin at different pressures. It falls in classifications for vehicle brake control systems with electrical assistance or drive (B60T13/74), antilock/brake regulation (B60T8/1761), and systems with an additional fluid circuit including fluid-pressurising means (B60T8/40). Prior-art keywords listed are pressure, piston, braking system, wheel, and brake.
Source: https://patents.google.com/patent/[US9211874](/patent/US9211874)/en
What the excerpt does not establish: It does not provide the claims, detailed description, or drawings, so the precise claimed scope, claim limitations, and specific embodiments cannot be stated here. The classification entries, prior-art keyword list, and "Effects" counts are metadata, not evidence of claim content. The source itself flags the priority date, legal status, and assignee data as assumptions or non-legal conclusions; litigation or ownership changes, validity, and prior-art specifics are not established by this excerpt and were not researched per instruction.
Generated 10/1/2026, 9:32:44 PM
Cases on file (0)
Specific litigation cases in our database that name US patent 9211874. The free-form analysis below may also discuss cases beyond this list.
No cases on file mention this patent. Upload a CSV or add a case manually in Admin → Manage litigation cases.
Litigation summary
Past and pending lawsuits — plaintiffs, defendants, jurisdictions, outcomes, and notable rulings.
Proceedings on file (0)
All PTAB activity →AIA trial proceedings (IPR / PGR / CBM) filed at the USPTO Patent Trial and Appeal Board against this patent. Sourced from the USPTO Open Data Portal and refreshed every six hours; each proceeding number deep-links to the PTAB E2E docket.
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.