How to Create an Evidence of Use (EOU) Claim Chart | Infographics | IIP Search

Creating an Evidence of Use (EOU) claim chart is a critical step in identifying potential patent infringement and supporting IP enforcement strategies. This detailed process involves selecting strong independent claims, identifying target products using public and industry data, collecting technical evidence such as datasheets and product specs, and meticulously mapping each claim element to product features. The final output is a structured claim chart backed by solid documentation, making it a powerful tool for licensing, litigation, or negotiation. Learn how professionals craft these charts with accuracy and legal precision.

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EVIDENCE OF USEEVIDENCE OF USE
(EOU) SEARCH
How To Conduct an
01
Select Strong Patent Claims
Focus is placed on the independent
claims of a granted patent. These are
broader and typically enforceable.
Narrow or dependent claims are
reviewed only when necessary.
02
Identify Target Products
Using databases, industry insights,
and public information, researchers
pinpoint products likely using the
patented technology.
03
Collect Supporting Evidence
This includes datasheets, user guides,
product specifications, teardown
analyses, whitepapers, product demos,
and public websites. In software-
related inventions, screenshots and
functionality testing are used.
04
Map Claims to Product
Features
Each claim element is matched with
the corresponding product feature. This
process is meticulous. Any mismatch
can invalidate the EOU chart.
05
Create the EOU Claim Chart
A structured claim chart is prepared
where each element is backed by
visual, textual, or documented
evidence, showing how the accused
product aligns with the claim language.