Invalidity dossier
US 10134888
Semiconductor device and method of manufacturing the same
Current assignee: Renesas Electronics Corp
Added 9/23/2026, 6:33:57 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 — US10134888B2
Title: "Semiconductor device and method of manufacturing the same"
Assignee: Renesas Electronics Corp (listed as both current and original assignee; the source notes assignee listings "may be inaccurate" and that Google Patents "has not performed a legal analysis").
Inventor: Nao Nagata.
Key dates (as listed): Priority date 2015-09-25; filing date 2018-05-30 (application US15/992,405); publication of US20180277668A1 on 2018-09-27; granted/publication date 2018-11-20; anticipated expiration 2036-09-21. Legal status listed as "Active" (expressly an assumption, not a legal conclusion).
Purpose and plain-language scope: The patent concerns a semiconductor device and its manufacturing method. The classifications place it in the field of vertical, trench-gate insulated-gate bipolar transistors (IGBTs) — vertical IGBTs having non-planar surfaces, including trench-gate structures — with additional classification aspects relating to breakdown-voltage control, guard rings/supplementary doped regions, field plates, and power-conversion applications (e.g., DC-to-AC inverters). The prior-art keywords supplied are "region," "trench," "type," "semiconductor device," and "semiconductor," indicating the disclosure centers on conductivity-type regions and trench structures in a semiconductor device. The classification families suggest the scope encompasses controlling electric-field concentration and breakdown voltage, buried guard-ring or supplementary regions, and top-view cellular layouts of IGBT/multi-cell DMOS-style devices, alongside fabrication and treatment of such IGBTs.
Source: https://patents.google.com/patent/[US10134888](/patent/US10134888)/en
What the excerpt does not establish: The supplied text is a bibliographic/classification excerpt only. It contains no abstract, claims, detailed description, drawings, or embodiments, so the actual claimed scope, specific structures, layer arrangements, materials, doping schemes, and manufacturing steps cannot be stated from this source. It likewise does not establish inventorship disputes, the accuracy of assignee or legal-status data, prosecution history, or validity. No litigation, ownership-transfer, or prior-art analysis was performed, per the stated limits.
Generated 10/1/2026, 9:42:43 PM
Cases on file (0)
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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.