Assignment history — US Patent 8358103

Inventors

Jeffrey Raymond Eastlack. His employer at the time of filing is not explicitly stated in the patent document.

Original assignee

Vampire Labs LLC. The patent does not indicate that Vampire Labs LLC shipped a product embodying the claims. Their primary line of business, based on the patent's content, appears to be related to battery charging technology and the prevention of vampiric power loss. The current status of Vampire Labs LLC is "Active - Reinstated", expiring on 2031-09-19.

Assignment timeline

No assignments for US Patent 8358103 were found on the USPTO Assignment Center. This means that the original assignee, Vampire Labs LLC, still holds the patent as per USPTO records.

Timeline diagram

timeline
    title Ownership of US 8358103
    2009 : Filed by Vampire Labs LLC
    2013 : Issued to Vampire Labs LLC

NPE / troll-pattern signals

Shell-entity transfer — not present. The patent remains with the original assignee, Vampire Labs LLC. While the name "Vampire Labs LLC" could potentially sound like a shell entity, there is no evidence of a transfer to a different entity with such naming conventions. Their website describes them as a developer of advanced power management technology with a focus on eliminating "Vampire Energy Loss" in mobile device battery chargers and microprocessor cores.
Known asserter in the chain — not present. Vampire Labs LLC is not listed as a known asserter on public NPE lists such as RPX or Unified Patents. However, recent litigation records from November 2024 and January 2026 indicate that Vampire Labs LLC has filed infringement suits against [Apple Inc.](/litigations/by-plaintiff/Apple%20Inc.) and Anker Innovations Ltd. in the Western District of Texas, and against Advanced Micro Devices, Inc., in the Texas Western District Court. Unified Patents has identified Vampire Labs LLC as an NPE in relation to case 1:24-cv-01377.
Repeat correspondent across the chain — not present. Since there are no recorded assignments, there is no chain of correspondents to analyze for repetition.
Cascading transfers — not present. No assignment records exist.
Pre-litigation transfer — unclear. While the patent has not been transferred, Vampire Labs LLC has initiated litigation in November 2024. Without assignment records, it's impossible to confirm if the patent was transferred specifically to enable assertion, although the timing of the litigation (November 2024) relative to the issue date (January 2013) suggests it was not immediately transferred for that purpose.
Bankruptcy fire-sale — not present. There is no indication of Vampire Labs LLC undergoing bankruptcy proceedings or selling patents in such a context.
Privateering — not present. There is no evidence from SEC filings or other public sources to suggest that Vampire Labs LLC is acting on behalf of an operating company to assert against competitors.
Defensive aggregator (anti-NPE) — not present. The patent is currently held by Vampire Labs LLC and has been involved in assertion, not defensive aggregation.

Verdict

NPE — moderate confidence. While there are no recorded assignments indicating a shell-entity transfer or cascading transfers, and no repeat correspondents, recent litigation filings from November 2024 and January 2026 clearly show Vampire Labs LLC asserting this patent against Apple Inc., Anker Innovations Ltd., and Advanced Micro Devices, Inc. in the Western District of Texas. Unified Patents classifies Vampire Labs LLC as an NPE. This active assertion behavior, despite not having transferred the patent, indicates an NPE strategy.