In what cases is patent infringement litigation filed, and what points should companies pay particular attention to?

Hello. This is an intellectual property rights attorney at Daeryun Law LLC.

Patent infringement litigation refers to a lawsuit that is filed when an invention falling within the technical scope of a patent right held by another is worked (such as by manufacturing, using, transferring, leasing, or importing) without the right holder's permission.

Because a patent right carries a strong exclusive right upon registration, if infringement is recognized, it is difficult to avoid legal liability even in the absence of intent.

Many companies mistakenly believe that 'there is no problem unless the technology was copied outright,' but the determination of patent infringement is made not on the basis of external similarity but on whether the technical elements described in the scope of the patent claims are satisfied.

In practice, representative cases that lead to patent infringement litigation are as follows.

(1) Where a product having a structure identical or similar to a competitor's patented technology is manufactured or sold
This may be judged as infringement if the core elements are identical, even where only part of the product's structure has been changed.

(2) Where a process or method patent is infringed
Even for an outwardly different product, method patent infringement becomes an issue if the same manufacturing process or mode of operation is used.

(3) Indirect infringement at the parts or materials stage
Even if it is not a finished product, infringement liability may be recognized where parts or equipment essential to working the patented invention are supplied.

(4) Working beyond the scope of a license
Even where there is a patent use agreement, use exceeding the scope of the contract constitutes infringement.

(5) Where a product is launched without sufficiently reviewing other companies' patents during the development stage
There are a great many cases in which 'unintended infringement' occurs due to insufficient prior-art searches.

If patent infringement is recognized, a company may simultaneously bear the following legal liabilities.

(1) Claim for damages: calculated on the basis of the actual amount of loss or a reasonable royalty

(2) Claim for an injunction and prevention of infringement: suspension of the manufacture, sale, and advertising of the product

(3) Order to destroy the infringing goods

(4) Punitive damages where willful infringement is recognized

Patent infringement litigation is a highly complex dispute that requires both technical judgment and legal interpretation, and the outcome can vary significantly depending on the initial response.

If you need a tailored strategy for each matter, ranging from reviewing whether infringement exists, responding to a warning letter, and defending litigation to filing claims for an injunction and damages, you may inquire with Daeryun Law LLC, where consultation appointments are available 24 hours a day, 365 days a year.