Analysis of Case Law on Punitive Damages for Intentional Infringement

Just as important as technological development is the respect for patent rights that protect that technology. Unfortunately, cases of unauthorized use of patented technology without the permission of the rightful owner continue to occur. The amended Patent Act, effective July 9, 2019, introduced a punitive damages system allowing for damages to be increased up to three times the amount for intentional patent infringement. This measure aims to raise awareness of patent infringement and strengthen the remedies available to rights holders.

Recently, the Patent Court made a significant ruling regarding the application of this punitive damages system (Patent Court Decision dated October 31, 2024, Case No. 2023Na11276). Pine IP Firm aims to highlight the risks of intentional patent infringement and key considerations for businesses through this ruling.

Case Overview

This case involved a claim for damages filed by kitchenware manufacturer Company A (Plaintiff) against its competitor Company C (Defendant), alleging that the defendant had unauthorizedly used the plaintiff's patent for a 'lid for cooking vessels' (hereinafter 'the patented invention') to manufacture and sell vacuum pot products (hereinafter 'the defendant's products').

According to the facts established by the court, the defendant continued to infringe the patent under the following circumstances:

1. Prior Knowledge and Failed Negotiations: The defendant was aware of the existence of the patented invention prior to this case through its business relationship with the plaintiff. In approximately 2015, negotiations were held regarding the use of the patent, but they failed due to disagreements over royalties and other issues.
2. Infringement Began During Negotiations: Starting around November 2015, while negotiations were ongoing, the defendant began producing and selling products incorporating the patented invention without the plaintiff's permission.
3. Demand to Cease Infringement Ignored: In approximately February 2019, the plaintiff notified the defendant of the patent infringement and sent a demand letter to cease the infringing activities. However, the defendant continued to infringe.
4. Infringement Continued After Losing Legal Battles: In June 2019, the defendant filed invalidation trials for the patented invention and declaratory judgment trials seeking to confirm that its products did not fall within the scope of the patent rights. Both were dismissed by the Intellectual Property Trial and Appeal Board in December 2020. Even after losing the subsequent appeal to the Patent Court, with the judgment becoming final in August 2021, the defendant continued to sell its products until October 2022.

Court's Decision

The Patent Court clearly determined that the defendant's actions constituted intentional patent infringement. The grounds for this decision are as follows:

• The defendant, aware of the patent, produced and sold products without authorization after negotiations failed.
• The defendant continued infringing activities despite the plaintiff's explicit demand to cease.
• The defendant persisted in infringement for an extended period even after the final judgment confirming the invalidity of the patent and the scope of rights.

The court ruled that the defendant's arguments, such as the 'expert opinion on patent invalidity' and 'management change,' did not provide sufficient grounds to negate intent. Specifically, the expert opinion was prepared after the infringement had already begun, explicitly stated it had no legal binding force, and contradicted the actual litigation outcome.

Key Ruling on the Scope of Punitive Damages Application

The defendant argued that the punitive damages provisions could not be applied because the infringement began before the punitive damages system took effect on July 9, 2019. This was a critical issue concerning the interpretation of Article 3 of the Supplementary Provisions of the Patent Act ("This Act shall apply from the first infringing act that occurs after the enforcement of this Act.").

In response, the court clearly ruled that the supplementary provision stipulated the period to which the punitive damages system applies (from infringing acts occurring after the effective date), and did not mean it only applied to cases where infringement *first* began after the effective date. In other words, the court clarified that punitive damages apply to infringing acts occurring after the effective date, even if the infringement had been ongoing prior to the law's enactment. This will serve as an important precedent for future similar cases.

Calculation of Damages

The court first calculated the damages based on Article 128(4) of the Patent Act (Presumption of Infringer's Profits). The defendant's total sales of approximately 50.1 billion KRW were multiplied by the deemed profit margin of 7.6% (based on the National Tax Service's notified simplified expense ratio of 92.4%). The basic damages were calculated as approximately 760 million KRW, recognizing the patented invention's contribution rate of 20% to the defendant's product sales.

• Basis for Determining Contribution Rate (20%): The court acknowledged that the patented invention was a crucial technical element that improved the sealing performance, a core function of the defendant's product (vacuum pot), and provided visual differentiation. However, considering that other patents/designs held by the defendant (check valve, packing structure, standing handle, etc.) and non-technical factors such as the defendant's capital and marketing activities also contributed to sales, the contribution rate was limited to 20%.

Furthermore, the court applied a 2x punitive multiplier to the damages incurred during the period when punitive damages were applicable (July 9, 2019 - October 31, 2022), which amounted to approximately 88 million KRW.

• Basis for Determining Punitive Multiplier (2x): The court determined the punitive damages multiplier by comprehensively considering the factors outlined in Article 128(9) of the Patent Act, including: ▲ the defendant's superior position (plaintiff was a subcontractor with a significant size difference) ▲ high degree of intent (confirmed intent) ▲ prolonged and numerous infringing acts ▲ substantial economic benefits derived from infringement ▲ the defendant's financial status ▲ insufficient efforts for remedy.

Ultimately, the court ordered the defendant to pay a total of 850,660,000 KRW (= approximately 675 million KRW for pre-enactment damages + approximately 88 million KRW for post-enactment damages × 2x multiplier) plus delayed interest.

Implications for Businesses

This ruling once again underscores the court's strict stance against intentional patent infringement. Business executives and personnel must keep the following points firmly in mind:

1. Thorough Prior Patent Search: Before launching new products, conduct a meticulous review of patents from competitors or related technology fields to preemptively block potential infringement.
2. Do Not Ignore Warning Letters: Upon receiving a cease and desist letter from a patent holder, do not dismiss it lightly. Immediately consult with legal experts to explore response strategies.
3. Good Faith Negotiation Efforts: Approach licensing negotiations with sincerity. Do not hastily use technology if negotiations fail.
4. Risk of Continued Infringement During Litigation: Even while pursuing litigation asserting patent invalidity or non-infringement, there remains a risk of being found liable for infringement until the final judgment. Continuing infringing activities, especially when facing a potential loss, further solidifies the intent to infringe.
5. The Real Threat of Punitive Damages: Be aware that intentional infringement can lead to damages up to three times the actual losses, potentially causing severe damage to corporate operations.

Conclusion

Patent rights are a social agreement that fosters innovation and a valuable asset for businesses. Respecting the rights of others is fundamental to a sound market order and is the best way to prevent legal disputes and substantial losses. The punitive damages system further solidifies these principles.

Pine IP Firm provides expert legal services across all aspects of intellectual property, including patent application and management, dispute prevention, and response. If you have any concerns regarding patents, please do not hesitate to consult with our experts.