Evidence of Use Charts That Prove Your Patents Are Being Used
EoU charting services that turn product evidence into licensing leverage and litigation-ready proof, with every mapping verified by a qualified patent professional.
An evidence of use (EoU) chart is a claim chart that maps the elements of a patent claim to a specific commercial product, service, or standard implementation, proving that the patented invention is actually being used. EoU charts are the core evidence asset in licensing negotiations, pre-litigation diligence, and patent acquisition pricing.
What's inside an evidence of use chart
Built to convince two audiences at once: business stakeholders at the negotiating table and technical experts across it.
Claim-to-product mapping
Every limitation of each asserted claim mapped to the specific product feature, datasheet, or behavior that reads on it, with the exact source cited.
Product documentation mining
User manuals, technical specifications, developer documentation, regulatory filings, and marketing material systematically mined for usable evidence.
Software & firmware evidence
Where the evidence lives in code, we incorporate code-level findings and your reverse-engineering inputs to complete the mapping.
Infringement-readiness assessment
An honest read on chart strength: which elements are solidly mapped, which are arguable, and where the evidence gaps are, before the other side finds them.
Licensing-ready packaging
Charts formatted for outreach and negotiation: clear enough for business stakeholders, rigorous enough for opposing counsel and technical experts.
Portfolio-scale EoU programs
Systematic charting across portfolios and product lines, so your strongest monetization candidates surface first instead of last.
How we verify every deliverable
AI-assisted research, verified line by line by qualified patent professionals on every engagement, not just the big ones.
AI-assisted evidence sweep
Our tooling mines product documentation, technical literature, and web sources at machine scale, surfacing candidate evidence for every claim element.
Human verification, element by element
A qualified patent professional confirms every mapping against the primary source and discards anything that does not genuinely read on the claim.
Expert review before delivery
The finished chart is reviewed for completeness, citation accuracy, and negotiation-readiness, the standard behind our 1200+ delivered charts.
The Zero-Hallucination Guarantee
Every EoU chart we deliver is backed by our Zero-Hallucination Guarantee: each mapping cites real, verifiable evidence, and nothing is fabricated or assumed. Where evidence for an element does not exist, the chart says so plainly. An honest gap is strategic information; a fabricated mapping is a liability.
Turnaround and pricing
Our AI-assisted workflow compresses the evidence-gathering phase, so we deliver EoU charts up to 10× faster than traditional research firms, in days rather than weeks. Standard charts typically ship within 5 to 7 business days, with 48 to 72 hour turnaround for rush matters.
Pricing is accessible and competitive: fixed-fee project pricing or retainer arrangements, with volume discounts for portfolio-scale programs. Contact us for a scoped quote on your patents and target products.
Evaluating providers? Ask us for an anonymized sample EoU chart when you get in touch. You will see exactly how we map elements, cite evidence, and flag weak mappings before you spend anything.
Frequently asked questions
What is an evidence of use (EoU) chart?
An evidence of use chart is a claim chart that maps each element of a patent claim to a specific commercial product, service, or standard implementation, documenting that the patented invention is actually being used. EoU charts are the core evidence asset in licensing negotiations, pre-litigation diligence, and patent acquisition pricing.
How is an EoU chart different from a claim chart?
A claim chart is the general deliverable: claim elements mapped to any kind of evidence, including prior art. An evidence of use chart is a claim chart aimed specifically at products on the market, built to prove real-world use of the invention. Every EoU chart is a claim chart; not every claim chart is an EoU chart.
What evidence goes into an EoU chart?
Typical sources include product documentation, technical specifications, user manuals, developer guides, marketing material, and standards documents. Where the evidence lives in software or firmware, code-level findings or reverse-engineering inputs are incorporated. Every mapping cites the exact source it relies on.
When do you need an EoU chart?
When you are preparing licensing outreach, deciding whether to assert a patent, pricing a patent for acquisition or sale, or building a pre-litigation record. A strong EoU chart converts “we think they infringe” into documented, element-by-element proof that survives scrutiny from opposing counsel.
How long does an EoU chart take?
Standard EoU charts are typically delivered within 5 to 7 business days, with 48 to 72 hour turnaround available for rush matters. Portfolio-scale charting programs are scoped to your timeline and licensing calendar.
How much does an EoU chart cost?
Cost depends on claim count, the number of products charted, and how hard the evidence is to obtain. We offer fixed-fee project pricing and retainer arrangements at accessible, competitive rates. Contact us with your patent and target products for a scoped quote.
Turn suspected use into documented proof
Tell us which patents and products are in scope. A specialized patent professional will respond within one business day.
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