DCT

3:26-cv-10864

Voltstar Tech Inc v. Apple Inc

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I. Executive Summary and Procedural Information

  • Parties & Counsel:
  • Case Identification: 1:26-cv-04285, N.D. Ill., 04/16/2026
  • Venue Allegations: Plaintiff alleges venue is proper because Defendant has committed acts of infringement in the district and maintains a regular and established place of business, including multiple retail stores, within the Northern District of Illinois.
  • Core Dispute: Plaintiff alleges that Defendant’s Apple 20W USB-C Power Adapter and Apple MagSafe Charger infringe four patents related to the mechanical design of compact power adapters and energy-saving circuitry for reducing "phantom load."
  • Technical Context: The technology concerns compact, efficient power adapters for consumer electronics, a market where size, user convenience, and energy conservation are significant competitive factors.
  • Key Procedural History: Two of the asserted patents, U.S. Patent Nos. 7,910,833 and 7,960,648, have undergone significant post-grant proceedings, including inter partes reexamination and inter partes review (IPR), resulting in the cancellation and amendment of numerous claims. The asserted claims in these patents are among those that were amended, which may give rise to arguments concerning claim scope and prosecution history estoppel. Additionally, U.S. Reissued Patent Nos. RE48,794 E and RE50,625 E are reissues of an original patent, a process that involved amending claim language to narrow its scope.

Case Timeline

Date Event
2008-05-21 Priority Date for '794 and '625 Patents
2008-05-27 Priority Date for '833 and '648 Patents
2011-03-22 U.S. Patent No. 7,910,833 Issues
2011-06-14 U.S. Patent No. 7,960,648 Issues
2012-09-14 Reexamination Requested for '833 and '648 Patents
2015-05-05 U.S. Patent No. 9,024,581 (Original of '794 and '625) Issues
2015-12-01 Reexamination Certificate for '648 Patent Issues
2016-10-12 IPR Filed for '833 Patent (IPR2017-00067)
2017-11-03 Reexamination Certificate for '833 Patent Issues
2021-10-26 U.S. Reissued Patent No. RE48,794 E Issues
2022-01-21 IPR Certificate for '833 Patent Issues
2022-10-07 U.S. Reissued Patent No. RE50,625 E Issues
2026-04-16 Complaint Filed

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

U.S. Reissued Patent No. RE48,794 E - "Charger Plug with Improved Package"

  • Patent Identification: U.S. Reissued Patent No. RE48,794 E, "Charger Plug with Improved Package," issued October 26, 2021 Compl. ¶8

The Invention Explained

  • Problem Addressed: The patent describes conventional power adapter plugs as being bulky, often interfering with adjacent wall outlets, and expensive to manufacture due to processes like insert molding of AC blades and manual soldering of internal components RE48,794 E Patent, col. 1:47-50 RE48,794 E Patent, col. 2:1-24
  • The Patented Solution: The invention is a "reduced plug-size charger plug" with an improved package design that simplifies assembly and reduces size RE48,794 E Patent, abstract It utilizes separate blade members that slide into a housing and connect to the internal printed circuit board (PCB) via solder-less "spring contacts," eliminating the need for insert molding and hand soldering RE48,794 E Patent, col. 4:1-14 RE48,794 E Patent, fig. 2B The complaint includes an image of a similar charger concept from the patent family to illustrate the general form factor Compl. p. 5
  • Technical Importance: This design approach addresses the market need for smaller, more convenient, and more cost-effective power adapters for the expanding portable electronics market RE48,794 E Patent, col. 1:20-25

Key Claims at a Glance

  • The complaint asserts infringement of at least Claim 1 of the '794 Patent Compl. ¶48
  • Independent Claim 1 requires:
    • A charger plug for converting 120V input power to DC output power.
    • First and second separate blade members secured within a housing.
    • A DC connector to connect a power cord.
    • A housing with a specific configuration, including a front wall, an outer profile, and a rear end.
    • The plug being sized so the housing has a longitudinal length of less than 2.0 inches and a width of less than 1.75 inches.
    • The housing's outer profile having "no interference with an adjacent receptacle" when plugged in.

U.S. Reissued Patent No. RE50,625 E - "Charger Plug with Improved Package"

  • Patent Identification: U.S. Reissued Patent No. RE50,625 E, "Charger Plug with Improved Package," issued October 7, 2022 Compl. ¶15

The Invention Explained

  • Problem Addressed: Like its parent, the '625 Patent addresses the cost and manufacturing complexity of conventional chargers, particularly the reliance on soldering to connect AC blades to internal circuitry RE50,625 E Patent, col. 2:15-24
  • The Patented Solution: The patent details the internal structure for a solder-less assembly, focusing on the use of "spring contacts" to create the electrical connection between the AC blades and the PCB Compl. ¶17 These contacts are designed to be mounted on the board and establish a secure, biased connection with the blades when the housing is assembled, simplifying manufacturing RE50,625 E Patent, abstract RE50,625 E Patent, col. 9:40-10:1
  • Technical Importance: The invention provides a method for mass-producing compact chargers more efficiently and at a lower cost by eliminating manual, error-prone assembly steps RE50,625 E Patent, col. 2:5-11

Key Claims at a Glance

  • The complaint asserts infringement of Claims 22, 23, 26, 28, 29, 30, 33, 36, 37, 38, and 41 Compl. ¶53
  • Independent Claim 23, as a representative asserted independent claim, requires:
    • A charger plug for converting 120V AC to DC power.
    • Non-movably secured blade members extending from a housing.
    • A DC connector for a power cord.
    • A printed circuit board located inside the housing.
    • "Permanent spring-loaded electrical connections" between the non-movable blade members and the front end of the printed circuit board.

U.S. Patent No. 7,910,833

Technology Synopsis

The '833 Patent addresses "phantom load," which is the residual power consumed by a charger when the connected electronic device is fully charged or unplugged Compl. ¶21 '833 Patent, col. 2:1-4 The invention is a power adapter with circuitry that automatically shuts off power from the AC source when it detects that the device is no longer drawing a significant load, thereby saving energy and extending battery life Compl. ¶21 '833 Patent, abstract

Asserted Claims

Claims 24 and 33, as amended by inter partes reexamination, are asserted (Compl. ¶¶43, 58). Independent Claim 24, as amended, is the basis for this count.

Accused Features

The complaint alleges the Apple MagSafe Charger's "internal monitoring and switch circuitry features" perform the patented energy-saving function Compl. ¶43

U.S. Patent No. 7,960,648

Technology Synopsis

The '648 Patent also targets phantom load in chargers Compl. ¶25 It discloses a cable assembly with an integrated, remotely located switch, allowing the user to manually or automatically disconnect the charger from AC power without unplugging it from the wall '648 Patent, abstract The switch can be co-located with the connector that plugs into the electronic device for user convenience '648 Patent, col. 1:16-24

Asserted Claims

Claims 31, 32, and 39, as amended by inter partes reexamination, are asserted (Compl. ¶¶43, 63). Independent Claim 31, as amended, is the basis for this count.

Accused Features

The complaint alleges the Apple MagSafe Charger's automatic shut-off feature infringes claims of the '648 Patent Compl. ¶43 Compl. ¶45

III. The Accused Instrumentality

Product Identification

The complaint names two accused instrumentalities: the Apple 20W USB-C Power Adapter ("Apple 20W Adapter") and the Apple MagSafe Charger ("Apple Wireless Charger") Compl. ¶26 Compl. ¶37

Functionality and Market Context

  • The Apple 20W Adapter is a compact power adapter that connects an AC wall outlet to a mobile device via a USB-C cable Compl. ¶27 The complaint alleges its small size is a key feature, claiming it does not block adjacent outlets Compl. ¶28 The complaint provides an image showing the product and its retail packaging Compl. p. 8 The infringement allegations center on the adapter's specific external dimensions and its internal construction, which allegedly includes a solder-less connection between the AC blades and the PCB Compl. ¶32 Compl. ¶34
  • The Apple Wireless Charger is a Qi-compliant wireless charging device that inductively charges compatible mobile devices Compl. ¶38 Compl. ¶39 The complaint includes an image of the product, showing its disc-like shape Compl. p. 10 The infringement allegations focus on its internal electronics, which allegedly include "monitoring circuitry to detect when a mobile electronic device requires charging or is fully charged" and switches to control current flow, thereby reducing phantom load Compl. ¶42

IV. Analysis of Infringement Allegations

The complaint references claim charts in Exhibits 5, 6, and 7, which were not provided with the pleading. The infringement theories are therefore summarized from the complaint's narrative allegations.

'794 and '625 Patent Infringement Allegations (vs. Apple 20W Adapter)

The complaint alleges that the Apple 20W Adapter infringes claims of the '794 and '625 patents. The core of the infringement theory for the '794 Patent is that the adapter's physical dimensions (allegedly 1.628 inches in length and 1.670 inches in width) meet the specific size limitations of claim 1, which require a length less than 2.0 inches and a width less than 1.75 inches Compl. ¶32 This small size is alleged to prevent interference with adjacent outlets, another element of the claim Compl. ¶28 For the '625 Patent, the theory is based on the adapter's internal construction. The complaint alleges the adapter "incorporates a 'spring contacts electrically connected to the blade members' ... without the use of solder," directly mapping to the language of the asserted claims focused on a solder-less assembly Compl. ¶34

Identified Points of Contention

  • Structural Questions: A primary factual dispute will likely concern the internal structure of the Apple 20W Adapter. The case may turn on whether the adapter's internal connectors between the AC prongs and the PCB can be characterized as the "spring contacts" that provide a "permanent spring-loaded electrical connection" as claimed in the '625 Patent. This will require technical evidence obtained from product teardowns and discovery.
  • Scope Questions: For the '794 Patent, while the complaint provides specific measurements for the accused adapter, a potential issue could be the methodology for measuring the "housing outer profile" as recited in the claims, and whether Defendant’s product falls within the claimed dimensional limitations under a proper construction of that term.

V. Key Claim Terms for Construction

  • The Term: "spring contacts" / "spring-loaded electrical connections"
  • Context and Importance: These terms are central to the inventions of the '794 and '625 patents, which are directed to a novel, cost-effective, solder-less assembly for compact chargers. The infringement analysis for the Apple 20W Adapter will depend on whether its internal connectors fall within the scope of these terms. Practitioners may focus on this term because it distinguishes the invention from prior art methods relying on direct soldering or more complex connectors Compl. ¶34
  • Intrinsic Evidence for Interpretation:
    • Evidence for a Broader Interpretation: The specification describes the spring contacts as being "simply formed of wire" and illustrates them as relatively simple components, which may support a construction that is not limited to a single, specific structure but rather encompasses a variety of resilient, conductive elements that establish a connection through biased physical contact RE50,625 E Patent, col. 9:35-40
    • Evidence for a Narrower Interpretation: The patents provide detailed figures of a specific embodiment of the spring contact, including a "snap-fit" elbow barb and a "spring arm" RE50,625 E Patent, figs. 16-18 A defendant may argue that the term should be limited to this disclosed structure or its close equivalents, especially if such features were crucial for distinguishing the invention over the prior art during prosecution.

VI. Other Allegations

  • Indirect Infringement: The complaint's formal counts are exclusively for "DIRECT INFRINGEMENT" and do not plead facts to support claims of induced or contributory infringement Compl. pp. 12-14
  • Willful Infringement: The prayer for relief requests a determination that Defendant's infringement has been "willful, wanton, and deliberate" and seeks treble damages Compl. p. 15, Prayer C However, the body of the complaint does not allege specific facts to support a finding of pre-suit knowledge or egregious conduct, which is typical for initial complaints filed after the Supreme Court's decision in Halo.

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

  1. Structural Identity: A central factual question for the '794 and '625 patents will be one of structural identity: does the internal construction of the Apple 20W Adapter, particularly its method of connecting AC blades to the PCB, correspond to the claimed solder-less "spring contacts," an issue that will depend on evidence from product teardowns and discovery.
  2. Functional Operation: For the '833 and '648 patents, a key evidentiary question will be one of functional equivalence: does the accused Apple MagSafe Charger's circuitry, which manages power for wireless charging, perform the specific function of sensing a low-power state and automatically cutting off AC input power to eliminate "phantom load" as required by the amended claims, or is there a material difference in its energy-saving mechanism?
  3. Claim Scope After Post-Grant Review: A significant legal question will be the impact of extensive post-grant proceedings: how will the court interpret the scope of the asserted claims in the '833 and '648 patents, given that they have been narrowed through both inter partes reexamination and IPR? This history may substantially constrain the patentee's infringement arguments, particularly under the doctrine of equivalents.