Uusi LLC v. Apple Inc

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: UUSI, LLC D/B/A NARTRON (Michigan)
  • Defendant: APPLE INC. (California)
  • Plaintiff's Counsel: Honigman Miller Schwartz and Cohn LLP
• Case Identification: 3:18-cv-04637, E.D. Mich., 11/22/2017
• Venue Allegations: Venue is alleged to be proper based on Defendant maintaining regular and established places of business (Apple Stores) in the district, transacting business in the district, and committing alleged acts of infringement in the district.
• Core Dispute: Plaintiff alleges that Defendant's iPhone, iPad, and iPod products infringe a patent related to capacitive touch switching circuits designed to improve reliability and reduce false actuations.
• Technical Context: The technology concerns high-frequency capacitive sensing, a foundational technology for improving the accuracy of touchscreens by distinguishing intentional user input from interference caused by surface contaminants.
• Key Procedural History: The patent-in-suit expired in 2016 but survived two ex parte reexaminations (in 2013 and 2014) and a subsequent inter partes review (IPR) initiated by Samsung, in which the Patent Trial and Appeal Board (PTAB) confirmed the patentability of all instituted claims in a 2017 final written decision. Plaintiff alleges it first notified Defendant of the patent and its alleged infringement in 2007.

Case Timeline

Date	Event
1996-01-31	'183 Patent Priority Date
1998-08-18	'183 Patent Issue Date
2007-01-01	Plaintiff alleges Defendant was aware of the '183 Patent since at least 2007
2013-04-29	First Reexamination Certificate (C1) for '183 Patent Issued
2014-06-27	Second Reexamination Certificate (C2) for '183 Patent Issued
2016-01-31	'183 Patent Expiration Date
2016-04-15	Samsung Electronics Co., Ltd. filed IPR petition against '183 Patent
2017-10-18	PTAB issued Final Written Decision upholding all instituted claims in IPR
2017-11-22	Complaint Filed

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

U.S. Patent No. 5,796,183 - "Capacitive Responsive Electronic Switching Circuit"

• Patent Identification: U.S. Patent No. 5,796,183 (the "'183 Patent"), "Capacitive Responsive Electronic Switching Circuit," issued August 18, 1998. The complaint asserts claims as amended by the first and second Reexamination Certificates (C1 and C2). Compl. ¶10 Compl. p. 10

The Invention Explained

• Problem Addressed: The patent's background section describes problems with prior art touch switches, including the physical strain of mechanical buttons and the unreliability of early capacitive switches. Compl. ¶13 '183 Patent, col. 1:56-62 Specifically, early capacitive touch systems were susceptible to false actuations caused by surface contaminants like skin oil or water, which could create unintended conductive paths, and by crosstalk between closely-spaced touch pads in a dense array. Compl. ¶14 '183 Patent, col. 4:14-24
• The Patented Solution: The invention proposes a capacitive touch circuit that operates at a high frequency (e.g., 50 kHz or greater, and preferably 800 kHz or greater) to distinguish a user's touch from interference. Compl. ¶15 '183 Patent, abstract At these higher frequencies, the capacitive impedance of a path through a user's body to ground becomes significantly lower than the primarily resistive impedance of a thin layer of contamination. Compl. ¶16 '183 Patent, col. 10:20-34 This large impedance differential allows the circuit to more reliably discriminate between an intended touch on one pad and a false signal on an adjacent pad caused by crosstalk through contamination, thereby enabling dense arrays of touch terminals. Compl. ¶15 '183 Patent, col. 5:48-57
• Technical Importance: This method of using high-frequency signals to mitigate the effects of surface contamination and crosstalk was an improvement that facilitated the creation of more reliable and densely packed touch-sensitive arrays, such as those used in modern touchscreens. Compl. ¶15

Key Claims at a Glance

• The complaint asserts "one or more claims," including at least independent claim 40, which was added during reexamination. Compl. ¶17 Compl. ¶19
• The essential elements of independent claim 40 include:
  • An oscillator providing a periodic output signal at a predefined frequency.
  • A microcontroller that uses the oscillator's signal to selectively provide signal output frequencies to a plurality of small input touch terminals arranged in a keypad.
  • The plurality of touch terminals on a dielectric substrate defining adjacent areas for user input.
  • A detector circuit, responsive to signals from the oscillator via the microcontroller, that provides a control output signal based on the presence of an operator's body capacitance to ground.
  • The frequencies are selected to decrease the impedance of the substrate relative to the impedance of any contaminant, and the detector circuit compares a sensed body capacitance change to a threshold to prevent inadvertent activation.
• The complaint's broad allegation of infringing "one or more claims" suggests the right to assert other independent or dependent claims is reserved. Compl. ¶17

III. The Accused Instrumentality

Product Identification

• The Accused Products include a wide range of Apple's mobile devices, such as the Apple iPhone (models 5 through 6s Plus), Apple iPod (Touch and nano models), and Apple iPad (various models including mini, Air, and Pro). Compl. ¶17

Functionality and Market Context

• The complaint alleges these products incorporate capacitive touch sensing devices, such as the "Multi-Touch display" on the iPhone. Compl. ¶18 It alleges on "information and belief" that the products use touchscreen controller chips from manufacturers like Broadcom and Texas Instruments. Compl. ¶19 These controllers are alleged to perform the functions of taking a periodic signal from an oscillator, providing signals to touch terminals, and detecting a user's touch via body capacitance to ground, all in a manner that mirrors the invention's method for distinguishing a true touch from interference caused by contaminants. Compl. ¶19

IV. Analysis of Infringement Allegations

No probative visual evidence provided in complaint.

The complaint's infringement theory is presented in a narrative format, which is summarized below in a claim chart for the representative asserted claim. Compl. ¶19

'183 Patent Infringement Allegations

Claim Element (from Independent Claim 40)	Alleged Infringing Functionality	Complaint Citation	Patent Citation
an oscillator providing a periodic output signal having a predefined frequency	The touchscreen controller takes a periodic signal from an oscillator with a pre-defined frequency.	¶19	col. 6:61-63
a microcontroller using the periodic output signal from the oscillator, the microcontroller selectively providing signal output frequencies to a plurality of small sized input touch terminals of a keypad...	The touchscreen controller selectively provides a signal output frequency to each row of input touch terminals on the touchscreen.	¶19	col. 18:34-46
the plurality of small sized input touch terminals defining adjacent areas on a dielectric substrate for an operator to provide inputs by proximity and touch	The input touch terminals on the touchscreen of the Accused Products define adjacent areas on a substrate for a user to provide inputs.	¶19	col. 7:48-52
a detector circuit ... being responsive to signals from said oscillator via said microcontroller and a presence of an operator's body capacitance to ground coupled to said touch terminals when proximal or touched by an operator to provide a control output signal	A detector circuit responds to signals from the oscillator through the touchscreen controller and the presence of the user's body capacitance to ground to provide a control output signal when touched.	¶19	col. 7:1-6
wherein said predefined frequency of said oscillator and said signal output frequencies are selected to decrease a first impedance of said dielectric substrate relative to a second impedance of any contaminate...	The Accused Products use input and output frequencies such that the change in impedance from a user's touch differs from any impedance change caused by contaminates on the substrate.	¶19	col. 5:48-54

• Identified Points of Contention:
  • Scope Questions: Claim 40 recites a "keypad". A potential point of contention is whether this term, which the patent specification associates with industrial controls and keyboards, can be construed to read on the multi-functional, graphical touchscreen displays of the accused smartphones and tablets. '183 Patent, col. 5:55-56
  • Technical Questions: The complaint alleges "on information and belief" that the accused products operate as claimed. Compl. ¶19 A central technical question will be whether discovery can produce evidence that the accused touch systems operate at frequencies that are specifically "selected to" achieve the claimed impedance differential for mitigating contamination, as opposed to being selected for other design reasons (e.g., display refresh rate or general signal-to-noise performance).

V. Key Claim Terms for Construction

• The Term: "keypad"

• Context and Importance: This term's construction is critical for determining the scope of claim 40. A narrow construction could place the accused graphical touchscreens outside the claim's reach, while a broader one could support infringement. Practitioners may focus on this term because its meaning will dictate whether the claim applies to modern smartphones.

• Intrinsic Evidence for Interpretation:

  • Evidence for a Broader Interpretation: The patent uses the term in the context of a "dense array" and depicts a generic "multiple touch pad circuit," which could support an interpretation covering any dense matrix of touch sensors, including a modern touchscreen. ('183 Patent, col. 5:54-56; '183 Patent, Fig. 11).
  • Evidence for a Narrower Interpretation: The specification's primary examples are industrial "palm buttons" and a "keyboard," which could support an argument that "keypad" is limited to arrays of discrete, fixed-function buttons rather than a dynamic graphical display. '183 Patent, col. 6:54-57

• The Term: "frequencies are selected to decrease a first impedance of said dielectric substrate relative to a second impedance of any contaminate"

• Context and Importance: This limitation defines the purported inventive concept. The infringement analysis will turn on whether Apple's system can be shown to have been designed with this specific purpose in mind.

• Intrinsic Evidence for Interpretation:

  • Evidence for a Broader Interpretation: The patent explains that operating at high frequencies (e.g., >50kHz) inherently achieves this impedance differential. '183 Patent, col. 5:48-54 '183 Patent, col. 11:1-10 Plaintiff may argue that choosing to operate in this frequency regime constitutes the act of "selecting" for this purpose, regardless of other design considerations.
  • Evidence for a Narrower Interpretation: The phrase "selected to" may be interpreted to require a specific intent or active design choice to solve the contamination problem. Defendant could argue that if its frequencies were chosen for other reasons (like performance or power consumption) and the anti-contamination effect is merely an incidental benefit, then this limitation is not met.

VI. Other Allegations

• Indirect Infringement: The complaint alleges induced infringement, stating Apple provides materials such as websites, user manuals, and marketing materials that instruct customers on how to use the accused infringing features. Compl. ¶22 It also alleges contributory infringement, asserting the accused products are a material part of the invention and not staple articles of commerce with substantial non-infringing uses. Compl. ¶23
• Willful Infringement: Willfulness is alleged based on pre-suit knowledge. The complaint claims Apple has been aware of the '183 Patent "since at least 2007" due to written communications from Nartron that identified the patent, explained the alleged infringement, and offered a license. Compl. ¶24

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

This case will likely hinge on the resolution of a few central issues:

• A core issue will be one of definitional scope: can the term "keypad," which is rooted in the patent's discussion of industrial buttons and keyboards, be construed broadly enough to encompass the dynamic, multi-functional graphical touchscreens of Apple's modern consumer electronics?

• A key evidentiary question will be one of technical purpose: can Plaintiff prove that the operating frequencies in Apple's touch systems are "selected to" create the specific impedance differential for mitigating contamination as required by claim 40, or does evidence show they were selected for entirely different technical reasons, with the claimed benefit being merely an inherent, unintended consequence?

• Finally, the case raises a significant question of willfulness and damages: given the patent's survival of multiple post-grant challenges and the allegation of notice to Apple a decade before the suit was filed, a court will have to determine whether Apple's conduct was objectively reckless, potentially exposing it to enhanced damages for infringement that occurred post-notice.