DCT

2:26-cv-00378

Ubiquitous Audio Synchronicity LLC v. Siemens Corp

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I. Executive Summary and Procedural Information

  • Parties & Counsel:
  • Case Identification: 2:26-cv-00378, E.D. Tex., 05/06/2026
  • Venue Allegations: Venue is alleged to be proper based on Defendant Siemens having a "regular and established place of business" within the Eastern District of Texas and having committed acts of infringement in the district.
  • Core Dispute: Plaintiff alleges that Defendant's UHF-RFID systems infringe a patent related to methods for improving the reliability of RFID tag reading and for positioning tags by overcoming radio frequency "dead spots."
  • Technical Context: The technology relates to Radio-Frequency Identification (RFID) systems, which are widely used in industrial automation, logistics, and supply chain management for tracking and identifying objects.
  • Key Procedural History: The asserted patent claims priority to a Japanese patent application filed in 2005, indicating the underlying invention predates the patent's 2006 U.S. filing date. The complaint does not mention any prior litigation, licensing history, or post-grant proceedings involving the patent.

Case Timeline

Date Event
2005-10-06 '888 Patent Priority Date
2006-09-28 '888 Patent Application Filing Date
2018-11-20 '888 Patent Issue Date
2026-05-06 Complaint Filing Date

II. Technology and Patent(s)-in-Suit Analysis

  • Patent Identification: U.S. Patent No. 10,133,888, "Data Reader and Positioning System," issued November 20, 2018.
  • The Invention Explained:
    • Problem Addressed: The patent's background section describes the technical challenge of radio frequency "dead spots" in RFID systems ʼ888 Patent, col. 1:31-41 These are null points where direct and reflected radio waves interfere destructively, preventing an RFID reader from communicating with or powering a tag, even if the tag is within the reader's theoretical range Compl. ¶19 This leads to unreliable data reading.
    • The Patented Solution: The invention proposes a system to overcome dead spots and enable high-accuracy positioning. One key technique involves using a phase adjustment circuit to systematically change the phase of the transmitted carrier wave ʼ888 Patent, col. 2:59-66 This change physically shifts the locations of the interference nulls, ensuring that a tag previously in a dead spot will eventually be in a location with sufficient signal strength to be read Compl. ¶20 The system also determines a tag's position by using a plurality of antenna units and sequentially changing their "radiation characteristics," such as polarization, beam direction, and frequency, to gather signal strength data from multiple perspectives Compl. ¶21 ʼ888 Patent, col. 3:20-44
    • Technical Importance: This technology aims to solve a fundamental reliability and accuracy problem in RFID applications, particularly in complex industrial environments with significant radio wave reflection and interference.
  • Key Claims at a Glance:
    • The complaint alleges infringement of "at least one or more claims" Compl. ¶5 and provides "as just one non-limiting example" language purportedly from Claim 1 Compl. ¶27 The asserted independent claim is Claim 1.
    • The essential elements of Independent Claim 1 are:
      • A positioning system, comprising:
      • a plurality of antenna units mounted in different places to read data from storage mediums... by using radio waves;
      • a control unit connected to each antenna unit, for controlling each antenna unit to sequentially change radiation characteristics of each antenna unit, wherein no dead spot occurs at a position in which each of the storage mediums is located at one or more time points among a plurality of time points;
      • and a positioning unit for calculating the position of each storage medium on the basis of strengths of signals... while having each antenna unit sequentially change its radiation characteristics.
    • The complaint does not explicitly reserve the right to assert dependent claims but does allege infringement of "one or more claims" Compl. ¶5

III. The Accused Instrumentality

  • Product Identification: The accused products are the Siemens SIMATIC RF600, RF610R, RF615R, RF615A, RF642L, RF645T, RF682T, RF650R, RF680 R, and RF685R UHF-RFID systems Compl. ¶2
  • Functionality and Market Context: The complaint identifies the accused products as "UHF-RFID systems" but does not provide specific technical details about their operation Compl. ¶2 The infringement allegations are based on the assertion that these systems perform the functions described in the patent claims, such as using multiple antennas and control units to read data from and determine the position of RFID tags Compl. ¶27 The complaint does not contain allegations regarding the specific commercial importance of the accused products beyond their inclusion in Siemens' product line.

IV. Analysis of Infringement Allegations

The complaint does not provide a formal claim chart exhibit. The infringement theory is outlined narratively, primarily in one paragraph that purports to quote elements of Claim 1.

'888 Patent Infringement Allegations

Claim Element (from Independent Claim 1) Alleged Infringing Functionality Complaint Citation Patent Citation
a plurality of antenna units mounted in different places to read data from storage mediums... by using radio waves The accused systems are alleged to comprise "a plurality of antenna units mounted in different places to read data from storage mediums." ¶27 col. 16:40-44
a control unit connected to each antenna unit, for controlling each antenna unit to sequentially change radiation characteristics of each antenna unit, wherein no dead spot occurs at a position in which each of the storage mediums is located at one or more time points among a plurality of time points The accused systems are alleged to have "a control unit connected to each antenna unit, for controlling each antenna unit to sequentially change radiation characteristics of each antenna unit." ¶27 col. 16:1-12
and a positioning unit for calculating the position of each storage medium on the basis of strengths of signals... while having each antenna unit sequentially change its radiation characteristics The accused systems are alleged to include "a positioning unit for calculating the position of each storage medium on the basis of strengths of signals... while having each antenna unit sequentially change its radiation characteristics." ¶27 col. 18:47-53
  • Identified Points of Contention:
    • Pleading Discrepancy: The complaint states it is providing an example from "Claim 1" Compl. ¶27 However, the language quoted in the complaint to describe the accused system includes "an antenna switch unit," an element that is not recited in the actual Independent Claim 1 of the '888 Patent but appears in other claims (e.g., dependent Claim 4) ʼ888 Patent, col. 29:14-16 This discrepancy raises the question of whether the plaintiff's infringement theory is properly aimed at the asserted claim or if the complaint contains a significant drafting error.
    • Scope Question: Claim 1 includes the functional limitation "wherein no dead spot occurs at a position in which each of the storage mediums is located at one or more time points." This is a negative limitation that requires proving a specific outcome. A point of contention may be what evidence can establish that this condition is met by the accused systems and what standard of proof is required to show the absence of a "dead spot."
    • Evidentiary Question: The complaint's infringement allegations are conclusory and do not include technical evidence (e.g., product manuals, test data, or architectural diagrams) detailing how the accused Siemens products perform the claimed functions Compl. ¶27 A key question will be whether the plaintiff can produce evidence to show that the accused systems "sequentially change radiation characteristics" and calculate position based on "strengths of signals" in the manner required by the claim.
  • Visual Evidence: No probative visual evidence provided in complaint.

V. Key Claim Terms for Construction

  • The Term: "sequentially change radiation characteristics"

    • Context and Importance: This term is central to the operation of the claimed system. Its construction will determine what actions qualify as infringement. Practitioners may focus on this term because the breadth of "radiation characteristics" (e.g., does it include only polarization, or also beam direction, frequency, etc.) and the meaning of "sequentially" will define the scope of the claim.
    • Intrinsic Evidence for Interpretation:
      • Evidence for a Broader Interpretation: The specification suggests a broad meaning, listing examples of radiation characteristics as "an electric field pattern, a beam direction, a beam width, etc." ʼ888 Patent, col. 2:4-6 and also including polarization and center frequencies ʼ888 Patent, col. 3:20-44 ʼ888 Patent, col. 3:57-60
      • Evidence for a Narrower Interpretation: A party might argue the term is limited by the specific embodiments, which focus on distinct sequences of changing polarization ʼ888 Patent, col. 16:15-22 or driving different antenna units at different times ʼ888 Patent, col. 12:1-13

  • The Term: "wherein no dead spot occurs"

    • Context and Importance: This result-oriented negative limitation is a critical part of Claim 1. The infringement analysis depends on whether this result is achieved by the accused system.
    • Intrinsic Evidence for Interpretation:
      • Evidence for a Broader Interpretation: The patent states the purpose is to avoid a "read disabled status" ʼ888 Patent, col. 2:64-65, which could support an interpretation that the system must only be capable of overcoming a dead spot to enable a read, not that it must guarantee 100% signal perfection at all times.
      • Evidence for a Narrower Interpretation: A defendant could argue for a literal interpretation, suggesting the claim requires proof of the absolute absence of a null point at the tag's location during the reading process. The patent's discussion of physically moving dead spots by shifting phase could be used to argue that the "occurrence" is what matters, and the claim requires this occurrence to be eliminated at the tag's location ʼ888 Patent, col. 15:20-39

VI. Other Allegations

  • Indirect Infringement: The complaint alleges both induced and contributory infringement. The inducement allegation is based on the claim that Siemens provides instructions to its customers on how to use the accused products in an infringing manner Compl. ¶30 Compl. ¶31 The contributory infringement allegation claims the accused products are "specially made or adapted for use in an infringing manner" and are not staple articles with substantial non-infringing uses Compl. ¶33
  • Willful Infringement: The complaint alleges that Siemens had pre-suit "actual knowledge of the '888 Patent," but provides no specific facts regarding the source or timing of this alleged knowledge Compl. ¶23 Compl. ¶29 Willfulness is also alleged based on knowledge gained "at least as early as the filing and/or service of this Complaint" Compl. ¶34

VII. Analyst's Conclusion: Key Questions for the Case

  • Pleading and Proof Alignment: A primary issue will be the apparent mismatch between the complaint's assertion of "Claim 1" and its description of infringement, which uses language from other patent claims Compl. ¶27 A key question is whether the plaintiff's factual theory of infringement can be mapped to the specific limitations of the actual, asserted Claim 1.
  • Demonstrating a Negative Condition: A central evidentiary hurdle for the plaintiff will be proving the negative limitation "wherein no dead spot occurs." The case may turn on what standard of evidence the court requires to demonstrate that the accused systems achieve this functional result across "one or more time points."
  • Definitional Scope: The ultimate infringement determination will likely depend on the court's construction of "sequentially change radiation characteristics." The core question will be one of definitional scope: does the term, as defined by the patent's specification, read on the specific technical operations of the accused Siemens RFID systems?
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