Unification Tech LLC v. Dell Tech Inc

I. Executive Summary and Procedural Information

• Parties & Counsel:
  • Plaintiff: Unification Technologies LLC (Texas)
  • Defendant: Dell Technologies, Inc. and Dell, Inc. (Delaware)
  • Plaintiff's Counsel: Nelson Bumgardner Albritton PC
• Case Identification: 6:20-cv-00499, W.D. Tex., 06/05/2020
• Venue Allegations: Venue is alleged to be proper based on Defendant Dell's regular and established places of business within the Western District of Texas, including offices in Round Rock and Austin, and because a substantial part of the infringing activities allegedly occurred in the District.
• Core Dispute: Plaintiff alleges that Defendant's solid-state drive (SSD) products infringe three patents related to methods for managing and deallocating data in non-volatile storage media.
• Technical Context: The technology concerns efficiency improvements in solid-state storage, specifically how storage controllers handle commands from an operating system to erase or deallocate data, which is critical for the performance and lifespan of SSDs.
• Key Procedural History: The complaint alleges that several major SSD market competitors, including Intel, Google, and Samsung, have taken licenses to the patents-in-suit. Following the filing of this complaint, Inter Partes Review (IPR) proceedings were initiated against the asserted patents. The asserted claims of two of the three patents-U.S. Patent Nos. 8,533,406 and 9,632,727-have since been cancelled, a development that will likely be dispositive for the counts of infringement related to those patents.

Case Timeline

Date	Event
2006-12-06	Earliest Priority Date for '658, '406, and '727 Patents
2013-09-10	Issue Date for U.S. Patent No. 8,533,406
2014-06-24	Issue Date for U.S. Patent No. 8,762,658
2017-04-25	Issue Date for U.S. Patent No. 9,632,727
2020-06-05	Complaint Filing Date
2020-12-22	IPR Proceedings Filed Against '658, '406, and '727 Patents (IPR2021-00343/4/5)

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

U.S. Patent No. 8,762,658 - Systems and Methods For Persistent Deallocation

• Patent Identification: U.S. Patent No. 8,762,658, "Systems and Methods For Persistent Deallocation," issued June 24, 2014.

The Invention Explained

• Problem Addressed: The patent's background section describes the inefficiency of traditional methods for erasing data in storage devices, such as overwriting files with null characters, which consumes bandwidth and is particularly ill-suited for solid-state storage where data is not typically overwritten in place ʼ658 Patent, col. 1:29-57
• The Patented Solution: The invention provides a system where a storage device receives a directive, rather than the data itself, indicating that a block of data is to be erased. In response, the device stores a compact "data segment token" that represents the erased or empty data segment, thereby freeing up storage space without the need to transmit and write large amounts of null data ʼ658 Patent, abstract ʼ658 Patent, col. 2:40-50
• Technical Importance: This method allows the storage device to manage deallocated space more efficiently, which can improve performance and extend the operational life of solid-state media by reducing unnecessary write cycles ʼ658 Patent, col. 1:44-51

Key Claims at a Glance

• The complaint asserts at least independent claim 1 Compl. ¶52
• The essential elements of independent claim 1 are:
  • An apparatus comprising a non-volatile storage medium.
  • A request receiver module configured to receive a message with a logical identifier, with the message indicating that data associated with that identifier has been erased.
  • A storage module configured to store persistent data on the medium in response to that message, where the persistent data indicates the associated data is erased.
• The complaint does not explicitly reserve the right to assert dependent claims.

U.S. Patent No. 8,533,406 - Apparatus, System, and Method For Identifying Data That Is No Longer In Use

• Patent Identification: U.S. Patent No. 8,533,406, "Apparatus, System, and Method For Identifying Data That Is No Longer In Use," issued September 10, 2013.

The Invention Explained

• Problem Addressed: The patent addresses the problem that typical file system "erase" commands only delete a directory entry, leaving the actual data on the storage device, while overwriting the data is inefficient and consumes valuable bandwidth and storage space ʼ406 Patent, col. 1:26-53
• The Patented Solution: The invention describes a storage controller that receives a message (e.g., a "hint" or "directive") containing a logical identifier for data that no longer needs to be preserved. In response, the storage controller can update its internal records-for example, by removing a mapping in an index-to indicate that the physical storage location associated with that logical identifier is now invalid and available for reclamation ʼ406 Patent, abstract ʼ406 Patent, col. 2:15-35
• Technical Importance: This allows the storage device to be aware of deallocated space, enabling it to more intelligently perform internal maintenance tasks like garbage collection, thereby improving overall system efficiency and endurance ʼ406 Patent, col. 2:48-54

Key Claims at a Glance

• The complaint asserts at least independent claim 15 Compl. ¶59 Note: This claim was cancelled in a post-filing IPR proceeding (U.S. Patent 8533406 K1).
• The essential elements of independent claim 15 are:
  • An apparatus with a non-volatile storage medium.
  • A request receiver module configured to receive an indication that a data structure has been deleted, where the indication includes a logical identifier associated with the data structure by a storage client.
  • A marking module configured to record that the data at the physical address mapped to the logical identifier can be erased.
• The complaint does not explicitly reserve the right to assert dependent claims.

U.S. Patent No. 9,632,727 - Systems and Methods For Identifying Storage Resources That Are Not In Use

• Patent Identification: U.S. Patent No. 9,632,727, "Systems and Methods For Identifying Storage Resources That Are Not In Use," issued April 25, 2017.
• Technology Synopsis: This patent discloses a system for managing a non-volatile storage medium where a storage controller receives a message, such as a hint or directive, that identifies data that no longer needs to be retained. The data is identified by a logical identifier. In response, the storage controller records an indication that the contents of the physical storage location associated with the logical identifier do not need to be preserved, facilitating more efficient use of storage resources ʼ727 Patent, abstract
• Asserted Claims: At least independent claim 1 Compl. ¶67 Note: This claim was cancelled in a post-filing IPR proceeding (U.S. Patent 9632727 K1).
• Accused Features: The complaint accuses Dell SSDs that include solid-state storage memory (e.g., NAND flash), a controller, and a flash translation layer. The infringement allegation centers on the SSDs removing assignments between logical and physical addresses in response to commands from the operating system, such as an UNMAP command Compl. ¶¶68-69

III. The Accused Instrumentality

Product Identification

• The complaint specifically identifies the "Dell 960GB SAS Read Intensive 12 Gbps 512e 2.5in. PM5-R Series SSD" as an exemplary accused product, and more broadly accuses "many types of SSD products" sold by Dell Compl. ¶42

Functionality and Market Context

• The complaint alleges the accused SSDs contain a non-volatile storage medium like NAND flash memory, a flash translation layer for mapping logical to physical addresses, and associated circuitry and software Compl. ¶53 The core accused functionality is the SSD's response to receiving commands such as the "UNMAP" command from an operating system, which the complaint alleges causes the SSD to store data indicating that certain data has been erased or is available for erasure Compl. ¶53 Compl. ¶61 The complaint notes that SSDs are a key product category for Dell Compl. ¶5
  No probative visual evidence provided in complaint.

IV. Analysis of Infringement Allegations

Since the complaint references claim-chart exhibits that are not provided, the infringement allegations are summarized below in prose.

'658 Patent Infringement Allegations

The complaint alleges that Dell's SSD products, such as the Dell SAS PM5-R Series SSD, meet the limitations of at least claim 1 Compl. ¶52 The theory of infringement posits that the accused SSDs contain a "non-volatile storage medium" (NAND flash memory), a "request receiver module" (circuitry and software), and a "storage module" (circuitry and software) Compl. ¶53 The complaint alleges that when the SSD receives a command like UNMAP from an operating system, this constitutes the claimed "message indicating that certain data has been erased." In response, the SSD allegedly "stores data...indicating that certain data has been erased," which the complaint equates with the claimed function of the "storage module" Compl. ¶53 Compl. ¶54

'406 Patent Infringement Allegations

The complaint alleges that Dell's SSDs infringe at least claim 15 of the '406 Patent Compl. ¶59 The infringement theory claims the SSDs constitute the claimed "apparatus" by including a "request receiver module" (circuitry) configured to receive an UNMAP command, which is framed as the claimed "indication that data has been deleted" Compl. ¶60 Compl. ¶62 The complaint further alleges the SSDs include a "marking module" that, in response to the UNMAP command, "indicates and records that data stored in the NAND flash memory...has been deleted and can be erased," thereby meeting that claim element Compl. ¶62

Identified Points of Contention

• Scope Questions: For the '658 Patent, a central question may be whether an SSD's internal management of its logical-to-physical address map in response to an UNMAP command constitutes "stor[ing] persistent data...to indicate that the data...is erased," as required by the claim. A court may need to determine if modifying an existing index is equivalent to storing new "persistent data."
• Technical Questions: For both patents, a key technical question is what evidence exists that the accused SSD's response to an industry-standard UNMAP command performs the specific functions recited in the claims. The complaint's allegations are centered on the UNMAP command, and the court will likely examine whether the technical operation of that standard aligns with the specific steps claimed in the patents.

V. Key Claim Terms for Construction

• Term from '658 Patent, Claim 1: "store persistent data ... to indicate that the data ... is erased"

  • Context and Importance: This term is the central functional step of the claim. The outcome of the infringement analysis may depend on whether the Defendant's SSDs, when receiving an UNMAP command, perform an action that can be construed as "storing" new "persistent data" for the purpose of indicating erasure, as opposed to merely deleting or modifying existing metadata.
  • Intrinsic Evidence for Interpretation:
    • Evidence for a Broader Interpretation: The specification discloses that indicating data does not need to be preserved can comprise "deleting an index entry," "invalidating an association," or "marking the contents of the physical storage location invalid" ʼ658 Patent, col. 4:21-26 This language may support a construction where any persistent change to metadata qualifies.
    • Evidence for a Narrower Interpretation: The Summary of the Invention describes storing a "data segment token that represents an empty data segment" ʼ658 Patent, col. 2:44-46 This could support a narrower construction requiring the creation of a new, specific data structure (a "token"), not just the modification of an existing one.

• Term from '406 Patent, Claim 15: "indication that a data structure ... has been deleted"

  • Context and Importance: Practitioners may focus on this term because the infringement theory equates the standard UNMAP command with this "indication." The dispute may turn on whether the UNMAP command itself conveys that a "data structure" (a higher-level concept like a file) has been deleted, or if it is merely a lower-level command to deallocate a range of logical block addresses.
  • Intrinsic Evidence for Interpretation:
    • Evidence for a Broader Interpretation: The abstract describes the message broadly as a "hint, directive, or other indication that the data has been erased and/or deleted" ʼ406 Patent, abstract This could support an argument that an UNMAP command functions as such a directive.
    • Evidence for a Narrower Interpretation: The claim specifically requires the indication to be that a "data structure" was deleted. An argument could be made that the UNMAP command operates on logical block addresses (LBAs), not file-system-level "data structures," and thus does not meet this limitation as written ʼ406 Patent, cl. 15

VI. Other Allegations

• Indirect Infringement: The complaint makes only a conclusory request for relief for indirect infringement and does not plead any specific facts to support a claim for either induced or contributory infringement Compl. ¶74(i)
• Willful Infringement: The complaint alleges that Dell has had knowledge of the patents-in-suit "at least since the filing of this lawsuit," which provides a basis for alleging post-suit willful infringement Compl. ¶56 Compl. ¶64 Compl. ¶71 The complaint also notes that "further discovery may reveal earlier knowledge," suggesting an intent to explore a claim for pre-suit willfulness Compl. ¶45

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

1. Viability of Claims: A threshold issue for two of the three counts is the post-filing cancellation of all asserted claims from the '406 and '727 patents in IPR proceedings. This development makes the infringement allegations for those patents untenable and will likely lead to their dismissal.
2. Definitional Scope: For the remaining '658 patent, the case will likely hinge on a question of claim construction: can the phrase "store persistent data ... to indicate that the data ... is erased" be construed to cover an SSD's internal modification of its logical-to-physical mapping tables in response to a standard UNMAP command, or does the claim require the creation of a new, distinct data element like a "token"?
3. Commercial Success & Licensing: A key factual question will be the relevance of the licensing history cited in the complaint. The allegation that major industry players have licensed the technology may be used by the Plaintiff to argue for the patents' validity and value, while the Defendant may seek to distinguish the circumstances of those licenses from the present case.