In what cases is a patent infringement lawsuit filed and what should companies particularly pay attention to?

Hello, I am an intellectual property specialist attorney at Daeryun Law Firm.

A patent infringement lawsuit refers to a lawsuit filed when an invention falling within the technical scope of a patent right held by another is implemented (manufactured, used, transferred, leased, imported, etc.) without the rights holder's permission.

Patent rights have strong exclusive rights upon registration, so even without intent, if infringement is recognized, legal liability is difficult to avoid.

Many companies misunderstand that "there is no problem if technology is not directly copied," but patent infringement judgment is made based on whether the technical components stated in the patent claim scope are met, not based on external similarity.

Representative cases that lead to patent infringement lawsuits in practice are as follows.

(1) When manufacturing and selling products with structures identical or similar to competitors' patented technology
– Even if some structures of the product have been changed, infringement may be judged if the core components are identical.

(2) When infringing process and method patents
– Even if the products appear different externally, if the same manufacturing process or operating method is used, infringement of method patents becomes an issue.

(3) Indirect infringement at the parts/materials stage
– Even if not a finished product, infringement liability may be recognized if parts or equipment essential for implementing the patented invention are supplied.

(4) Implementation exceeding the scope of license
– Even if there is a patent use contract, use beyond the scope of the contract constitutes infringement.

(5) Cases where products are released without sufficient review of other companies' patents at the development stage
– There are many cases of 'unintended infringement' due to insufficient prior art research.

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

(1) Damages claim: Calculation based on actual damages or reasonable royalty

(2) Infringement injunction and prevention claim: Cessation of product manufacture, sale, and advertising

(3) Order to dispose of infringing products

(4) Punitive damages if intentional infringement is recognized

A patent infringement lawsuit is a high-difficulty dispute requiring both technical judgment and legal interpretation, and the result can vary greatly depending on the initial response.

If you need a case-specific custom strategy from patent infringement review, response to warning letters, defense in lawsuits, or claims for infringement injunction or damages, please contact Daeryun Law Firm where consultation appointments are available 365 days, 24 hours.