Evidence of Use (EoU) Charts

Evidence of Use (EoU) facilitates in ascertaining potentially infringing products in the marketplace. Our product to patent claim elements mapping (EoU charts) provides an indication of the strength of patent infringement contention. For investing in a patent, an EoU investigation may prove useful to understand the scope of infringement of a potential patent t, provide price guidance and an indication of future revenue potential of the patent.

Prometheus IP has hands-on experience in preparing EoU charts. Our product and market research skills uncover potential patent infringing products. The research and analysis output is reported in a concise, user-friendly manner so that clients can quickly understand the findings and make a decision in further steps.

Sample Report


Our X-Factor

  • Implements reverse engineering technique to conduct evidence of use analysis.
  • Determine third-party infringement of patent claims.
  • Knowledge in patent law of various jurisdictions.
  • Extensive work experience in complex technology domains.
  • The insights from EoU charts help our clients to undertake strategic business decisions with respect to acquisition or licensing.
  • Detail claim chart analysis to support rule 11/337 investigation.

Prometheus IP Approach

  • Thorough review of product to identify the product features.
  • Thorough review of patent to identify the elements of the claim.
  • Framing search strategies to uncover the prior-art based on keywords, assignee, inventors, citations (forward and backward), patent classification codes (US,CPC, IPC, ECLA and F terms).
  • Preparing EoU charts.


  • MS-Word format including an executive summary, the conclusion of the study, and relevant results in-depth analysis.
  • An Excel file depicting the claim chart with different sections of potential publications disclosing the claim(s) subject to Infringement.
  • Reporting format includes a quick analysis table and claim chart that would help to quickly understand the output of the search report with respect to infringement.