Invalidity dossier
US 8441438
3D pointing device and method for compensating movement thereof
Current assignee: CM HK Ltd
Added 9/23/2026, 11:31:21 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 8,441,438 B2
Title: "3D pointing device and method for compensating movement thereof"
Patent number / application: US 8,441,438 B2; Application No. US 12/943,934.
Assignee / inventor: Original assignee Cywee Group Ltd.; inventors Zhou Ye, Chin-Lung Li, and Shun-Nan Liou. The excerpt also lists a later reassignment to "CM HK Ltd" (CM HK LIMITED) dated 2025-03-13, shown as the current assignee.
Key dates (as listed; priority/legal-status dates are stated as assumptions):
- Priority date: 2010-01-06
- Filing date: 2010-11-11
- Publication of US20110163950A1: 2011-07-07
- Grant/publication: 2013-05-14
- Adjusted expiration: 2031-06-17; status listed as Active.
Purpose (per the supplied "Definitions" text): The invention "generally relates to a three-dimensional (3D) pointing device utilizing a motion sensor module and method of compensating and mapping signals of the motion sensor module subject to movements and rotations of said 3D pointing device." More particularly, it concerns a 3D pointing device using a six-axis motion sensor module with an "enhanced comparison to calculate and compensate accumulated errors" so as to obtain "actual resulting deviation angles in spatial reference frame and under dynamic environments."
Plain-language scope (from the excerpt): A handheld 3D pointer — illustrated in FIG. 1 as a device 110 a user aims at a point on a 2D display screen 122 — whose motion-sensor signals are compensated and mapped to account for the device's movement and rotation, correcting accumulated sensor error to derive deviation angles in a spatial reference frame. The excerpt describes the pointing device 110 as emitting a light beam, with the beam's screen impact location being the point, and notes the device "may be a mou…" (text truncated).
Classifications listed: G09G5/00; G06F3/0346; G06F3/038; G06F3/0383.
Source: https://patents.google.com/patent/US8441438/en
What the excerpt does not establish: The full claim language is not reproduced, so claim scope cannot be quoted or delimited. It does not establish validity, enforceability, or the accuracy of the listed assignees, priority date, or legal status (the source labels the latter as assumptions). Omitted portions of the specification (e.g., the truncated description of device 110), the drawings, and the complete prosecution history are absent. A PTAB case IPR2019-00562 is noted as filed/instituted — this overview draws no conclusion from those litigation entries.
Generated 10/1/2026, 9:53:56 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.