Patent 7529305

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.

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Ownership chain (10)

Asserters network →

Structured records extracted from the assignment-history narrative below. Each entity links to its full ownership-network profile.

  1. 2003-09-24 · Assignment

    TONG, WEN; BAKULIN, MICHAIL G.; KREYNDELIN, VITALY B.; SHINAKOV, YURIY S.; SHLOMA, ALEXANDER M.NORTEL NETWORKS LIMITED

  2. 2011-07-29 · recorded 2011-10-28 · reel 027164/0356 · Assignment

    NORTEL NETWORKS LIMITEDROCKSTAR BIDCO, LP

    bankruptcy

  3. 2012-02-29 · recorded 2012-04-10 · reel 028018/0848 · Assignment

    ROCKSTAR BIDCO, LP2256355 ONTARIO LIMITED

    internal reorg

  4. 2012-03-02 · recorded 2012-04-10 · reel 028020/0474 · Assignment

    2256355 ONTARIO LIMITEDRESEARCH IN MOTION LIMITED

    internal reorg

  5. 2013-07-09 · recorded 2014-10-16 · reel 034012/0031 · Change of Name

    RESEARCH IN MOTION LIMITEDBLACKBERRY LIMITED

    change of name only

  6. 2023-03-20 · recorded 2023-04-27 · reel 063471/0474 · Assignment

    BLACKBERRY LIMITEDOT PATENT ESCROW, LLC

    transfer-to-asserter

  7. 2023-03-20 · recorded 2023-09-05 · reel 064806/0669 · CORRECTIVE ASSIGNMENT

    BLACKBERRY LIMITEDOT PATENT ESCROW, LLC

    correction

  8. 2023-05-11 · recorded 2023-06-16 · reel 064015/0001 · NUNC PRO TUNC ASSIGNMENT

    OT PATENT ESCROW, LLCMALIKIE INNOVATIONS LIMITED

    transfer-to-asserter

  9. 2023-05-11 · recorded 2023-06-19 · reel 064066/0001 · NUNC PRO TUNC ASSIGNMENT

    BLACKBERRY LIMITEDMALIKIE INNOVATIONS LIMITED

    transfer-to-asserter

  10. 2023-05-11 · recorded 2023-09-05 · reel 064807/0001 · CORRECTIVE ASSIGNMENT

    OT PATENT ESCROW, LLCMALIKIE INNOVATIONS LIMITED

    correction

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.

✓ Generated

Inventors

  • Wen Tong (Nortel Networks Ltd)
  • Michail G. Bakulin (Nortel Networks Ltd)
  • Vitaly B. Kreyndelin (Nortel Networks Ltd)
  • Alexander M. Shloma (Nortel Networks Ltd)
  • Yuriy S. Shinakov (Nortel Networks Ltd)

All named inventors were employed by Nortel Networks Ltd at the time of filing. No unusual patterns of inventors departing the original assignee within 12 months of filing are evident from the provided data.

Original assignee

The original assignee, as named on the issued patent, was Nortel Networks Ltd. Nortel Networks was a multinational telecommunications and data networking equipment manufacturer. Given the patent's subject matter in wireless communication (space-time coding and spatial multiplexing), it is highly probable that Nortel Networks shipped products embodying the claims as part of their core business offerings. Nortel Networks filed for bankruptcy protection in 2009 and subsequently sold off its business units and patent portfolio.

Assignment timeline

The following assignment timeline is reconstructed from the "Legal Events" section of the Google Patents page for US7529305B1, as direct access to the USPTO Assignment Center is not available. Correspondent information is not detailed in the provided Google Patents data.

  • 2003-09-24 (effective date not explicitly stated) / recorded N/A — Reel N/A

    • Conveyance: Assignment
    • Assignor: TONG, WEN; BAKULIN, MICHAIL G.; KREYNDELIN, VITALY B.; SHINAKOV, YURIY S.; SHLOMA, ALEXANDER M. (inventors)
    • Assignee: NORTEL NETWORKS LIMITED
    • Correspondent: Not provided in the source data.
    • Context: Initial assignment from inventors to the corporate entity.

  • 2011-07-29 (executed) / recorded 2011-10-28 — Reel 027164/0356

    • Conveyance: Assignment
    • Assignor: NORTEL NETWORKS LIMITED
    • Assignee: ROCKSTAR BIDCO, LP
    • Correspondent: Not provided in the source data.
    • Context: Acquisition of Nortel Networks' patent portfolio following its bankruptcy proceedings.

  • 2012-02-29 (executed) / recorded 2012-04-10 — Reel 028018/0848

    • Conveyance: Assignment
    • Assignor: ROCKSTAR BIDCO, LP
    • Assignee: 2256355 ONTARIO LIMITED
    • Correspondent: Not provided in the source data.
    • Context: Internal transfer within the Rockstar consortium.

  • 2012-03-02 (executed) / recorded 2012-04-10 — Reel 028020/0474

    • Conveyance: Assignment
    • Assignor: 2256355 ONTARIO LIMITED
    • Assignee: RESEARCH IN MOTION LIMITED
    • Correspondent: Not provided in the source data.
    • Context: Transfer within the Rockstar consortium, specifically to the entity that became BlackBerry.

  • 2013-07-09 (executed) / recorded 2014-10-16 — Reel 034012/0031

    • Conveyance: Change of Name
    • Assignor: RESEARCH IN MOTION LIMITED
    • Assignee: BLACKBERRY LIMITED
    • Correspondent: Not provided in the source data.
    • Context: Corporate name change of Research In Motion Limited to BlackBerry Limited.

  • 2023-03-20 (executed) / recorded 2023-04-27 — Reel 063471/0474

    • Conveyance: Assignment
    • Assignor: BLACKBERRY LIMITED
    • Assignee: OT PATENT ESCROW, LLC
    • Correspondent: Not provided in the source data.
    • Context: Transfer to a patent escrow entity.

  • 2023-05-11 (executed) / recorded 2023-06-16 — Reel 064015/0001

    • Conveyance: NUNC PRO TUNC ASSIGNMENT
    • Assignor: OT PATENT ESCROW, LLC
    • Assignee: MALIKIE INNOVATIONS LIMITED
    • Correspondent: Not provided in the source data.
    • Context: Transfer from escrow to Malikie Innovations Limited.

  • 2023-05-11 (executed) / recorded 2023-06-19 — Reel 064066/0001

    • Conveyance: NUNC PRO TUNC ASSIGNMENT
    • Assignor: BLACKBERRY LIMITED
    • Assignee: MALIKIE INNOVATIONS LIMITED
    • Correspondent: Not provided in the source data.
    • Context: Corrective or parallel assignment directly from BlackBerry to Malikie Innovations Limited.

  • 2023-03-20 (executed) / recorded 2023-09-05 — Reel 064806/0669

    • Conveyance: CORRECTIVE ASSIGNMENT
    • Assignor: BLACKBERRY LIMITED
    • Assignee: OT PATENT ESCROW, LLC
    • Correspondent: Not provided in the source data.
    • Context: Corrective assignment related to the initial transfer to OT Patent Escrow, LLC.

  • 2023-05-11 (executed) / recorded 2023-09-05 — Reel 064807/0001

    • Conveyance: CORRECTIVE ASSIGNMENT
    • Assignor: OT PATENT ESCROW, LLC
    • Assignee: MALIKIE INNOVATIONS LIMITED
    • Correspondent: Not provided in the source data.
    • Context: Corrective assignment related to the transfer to Malikie Innovations Limited.

Timeline diagram

timeline
    title Ownership of US 7529305
    2000 : Filed by Nortel Networks
    2003 : Assigned to Nortel Networks
    2009 : Issued to Nortel
    2011 : Assigned to Rockstar Bidco
    2012 : Assigned to 2256355 Ontario
         : Assigned to Research in Motion
    2014 : Name change to BlackBerry
    2023 : Assigned to OT Patent Escrow
         : Assigned to Malikie Innovations
         : Corrective assgmt OT Patent
         : Corrective assgmt Malikie

NPE / troll-pattern signals

  1. Shell-entity transfer — Present. The patent has been transferred to entities (Rockstar Bidco, LP; OT Patent Escrow, LLC; Malikie Innovations Limited) whose names and associated litigation activity suggest they are licensing-focused entities rather than operating companies producing products embodying the claims. Malikie Innovations Ltd is the current assignee and is involved in multiple listed litigation cases related to this patent family [cite: https://portal.unifiedpatents.com/[ptab](/ptab)/case/IPR2026-00003, https://portal.unifiedpatents.com/litigation/Washington%20Western%20District%20Court/case/2%3A24-cv-01490, https://portal.unifiedpatents.com/litigation/Texas%20Eastern%20District%20Court/case/2%3A25-cv-00163, https://portal.unifiedpatents.com/litigation/Georgia%20Northern%20District%20Court/case/1%3A25-cv-03600, https://portal.unifiedpatents.com/litigation/Delaware%20District%20Court/case/1%3A17-cv-00155].
  2. Known asserter in the chain — Present. Rockstar Bidco, LP, which acquired the patent on 2011-10-28 (Reel 027164/0356), is widely recognized as a patent assertion entity (often referred to as a "patent troll") that acquired the Nortel patent portfolio. The current assignee, Malikie Innovations Limited, is actively involved in multiple litigation cases concerning this patent family [cite: https://portal.unifiedpatents.com/ptab/case/IPR2026-00003, https://portal.unifiedpatents.com/litigation/Washington%20Western%20District%20Court/case/2%3A24-cv-01490, https://portal.unifiedpatents.com/litigation/Texas%20Eastern%20District%20Court/case/2%3A25-cv-00163, https://portal.unifiedpatents.com/litigation/Georgia%20Northern%20District%20Court/case/1%3A25-cv-03600, https://portal.unifiedpatents.com/litigation/Delaware%20District%20Court/case/1%3A17-cv-00155].
  3. Repeat correspondent across the chain — Unclear. Correspondent names and firms are not provided in the Google Patents legal events section, which is the sole source of assignment details for this analysis.
  4. Cascading transfers — Present. There are two notable instances of cascading transfers. First, in 2012, the patent was transferred from Rockstar Bidco, LP to 2256355 ONTARIO LIMITED (recorded 2012-04-10, Reel 028018/0848), and then almost immediately to RESEARCH IN MOTION LIMITED (recorded 2012-04-10, Reel 028020/0474). Second, in 2023, the patent transferred from BLACKBERRY LIMITED to OT PATENT ESCROW, LLC (recorded 2023-04-27, Reel 063471/0474), followed by multiple corrective assignments and Nunc Pro Tunc assignments to MALIKIE INNOVATIONS LIMITED (recorded 2023-06-16, Reel 064015/0001 and 2023-06-19, Reel 064066/0001, and multiple corrective assignments recorded 2023-09-05).
  5. Pre-litigation transfer — Present. The transfers to OT Patent Escrow, LLC (effective 2023-03-20, recorded 2023-04-27, Reel 063471/0474) and subsequently to Malikie Innovations Limited (effective 2023-05-11, recorded 2023-06-16, Reel 064015/0001) occurred around the patent's adjusted expiration date of 2023-04-02. These transfers immediately precede or are concurrent with ongoing and new litigation cases filed in 2024 and 2025 by Malikie Innovations Ltd [cite: https://portal.unifiedpatents.com/litigation/Washington%20Western%20District%20Court/case/2%3A24-cv-01490, https://portal.unifiedpatents.com/litigation/Texas%20Eastern%20District%20Court/case/2%3A25-cv-00163, https://portal.unifiedpatents.com/litigation/Georgia%20Northern%20District%20Court/case/1%3A25-cv-03600].
  6. Bankruptcy fire-sale — Present. The original assignee, Nortel Networks Limited, underwent bankruptcy, and its patent portfolio, including US7529305B1, was acquired by Rockstar Bidco, LP, as evidenced by the assignment recorded 2011-10-28 (Reel 027164/0356).
  7. Privateering — Unclear. While the initial transfer to Rockstar Bidco involved a consortium of operating companies, and the patent subsequently moved through BlackBerry, the final transfers to OT Patent Escrow, LLC and Malikie Innovations Limited suggest a focus on assertion for licensing revenue rather than an operating company using an NPE to sue on its behalf against competitors. More information on the agreements between Malikie and any operating companies would be needed to make a definitive call.
  8. Defensive aggregator (anti-NPE) — Not present. The chain ends with Malikie Innovations Limited, which is actively litigating the patent, rather than a defensive aggregator.

Verdict

NPE — high confidence. This verdict is supported by multiple strong signals. The patent was acquired from Nortel Networks in a bankruptcy fire-sale by Rockstar Bidco, LP (recorded 2011-10-28, Reel 027164/0356), a known patent assertion entity. The patent has since undergone cascading transfers, concluding with Malikie Innovations Limited (e.g., recorded 2023-06-16, Reel 064015/0001), which is a shell entity actively engaged in patent litigation, as shown by numerous listed lawsuits initiated after its acquisition [cite: https://portal.unifiedpatents.com/ptab/case/IPR2026-00003, https://portal.unifiedpatents.com/litigation/Washington%20Western%20District%20Court/case/2%3A24-cv-01490, https://portal.unifiedpatents.com/litigation/Texas%20Eastern%20District%20Court/case/2%3A25-cv-00163, https://portal.unifiedpatents.com/litigation/Georgia%20Northern%20District%20Court/case/1%3A25-cv-03600]. The pre-litigation transfer to Malikie Innovations Limited around the patent's expiration date further reinforces its assertion-focused nature.

For verification of assignment records, refer to the USPTO Assignment Center: https://assignmentcenter.uspto.gov/

Generated 5/25/2026, 6:49:08 AM