Estimating Risk in Patent Infringement

Assume that your company’s product may infringe a third party’s patent (Patent P).
Let us suppose that the potential damage, if the infringement risk materializes, is USD 10 million.

Note:
This damage amount (d) includes not only direct compensation but also:
・the risk of an injunction (product shipment suspension),
・reputational damage,
・business disruption caused by litigation or negotiations.

Next, assume that the probability of this risk (p1) materializing is 10%.

Note:
This probability (p1) depends on:
・pA: the probability that the patent holder enforces their rights, and
・pB: the probability that infringement is recognized in court.
Generally, when pB is high, pA also increases. There is also a possibility that Patent P may be invalidated.


Based on these assumptions, the expected loss (y1) is:
y1 = d × p1 + 0 × (1 − p1)
= 10,000,000 × 10% + 0 × 90%
= USD 1,000,000

Estimating Risk Reduction Through Design Changes

Now assume that a freedom-to-operate (FTO) analysis / patent infringement opinion is conducted, and based on the results, part of the product is redesigned.
After the design change, assume the probability (p2) decreases to 1%.

Let the cost (c) of the design change be USD 500,000.

Note:
This cost (c) includes:
・additional development costs,
・risk of delayed product release,
・potential decline in product competitiveness.

Assuming the damage amount (d) remains unchanged, the new expected loss (y2) is:
y2 = d × p2 + 0 × (1 − p2) + c
= 10,000,000 × 1% + 0 × 99% + 500,000
= USD 600,000

In this example, the expected loss decreases by USD 400,000.
This means the economic value of the patent opinion can be interpreted as USD 400,000, since it enabled that level of risk reduction.

When Not Changing the Design Is Rational

Consider another scenario:
・Initial probability p1 = 3%
・Post-design probability p2 = 1%

Under the same conditions:
・y1 = USD 300,000
・y2 = USD 600,000

In this case, the calculation suggests that making design changes actually increases total expected cost.
Therefore, a company may rationally choose not to redesign, accepting a certain level of risk.

However, this is purely based on expected value.
Some decision-makers may still prefer redesign, considering that even a 3% chance of a USD 10 million loss is too significant to ignore.

The Role of Patent Opinions in Business Decisions

A patent opinion provides input for management decisions.
The final decision is made by the company (the client).

Quantifying Risk: Beyond Binary Judgments

Even after conducting a patent analysis or redesigning a product, risk may not become zero.
Since the future is uncertain, it is easy to say:
“There is some risk, so you should avoid it.”

However, business often requires taking calculated risks.

A patent infringement analysis should not simply provide a binary conclusion of
“infringement” or “non-infringement.”

Instead, it should aim to quantify the level of risk to support effective risk management.
・Being overly risk-averse may prevent the creation of attractive products.
・Being too insensitive to risk may lead to serious damage.
A balanced approach is essential.

In practice, this requires:
・collecting relevant data,
・constructing arguments for both infringement and non-infringement,
・evaluating both sides objectively,
・and presenting a professional opinion with confidence.

Preventive vs. Reactive Patent Opinions

Patent infringement opinions are requested at different stages:

Preventive Opinions

Requested during product planning, before enforcement action.
・Allow flexible strategies, including design changes
・Enable proactive risk management

Reactive Opinions

Requested after receiving an infringement allegation.
・Often involve situations where the patent holder is confident
・Focus on building arguments to defend against infringement claims

Conclusion

The economic value of a patent opinion lies in its ability to reduce uncertainty and support rational decision-making.
Rather than eliminating risk entirely, a well-prepared opinion helps companies:
・understand risk quantitatively,
・compare strategic options,
・and make informed business decisions.

In today’s business environment, patent opinions are not just legal tools—they are key components of risk management and innovation strategy.