Introduction
A recent decision of the Guangzhou Intellectual Property Court provides a notable example of how Chinese courts may assess patent infringement when a software/control-method patent is implemented through a physical medical device.
The case concerned Chinese invention patent No. 201610615641.7, titled “A Dynamic Lighting Method”, and an accused floor-standing eye-accommodation training lamp registered as a medical device. Jiaquan IP’s Tan Yingqiang co-represented the patent owner in the dispute. The court found that the accused product fell within the scope of protection of the asserted claims and ordered the defendant to cease using the patented method and to pay damages and reasonable enforcement expenses.
Background of the Patent and Product
The asserted patent, “A Dynamic Lighting Method”, was filed on 28 July 2016 and granted on 9 March 2021. During the litigation, CNIPA issued an invalidation decision maintaining the patent valid. The patent owner asserted claims 1, 2, 4, and 7.
A key limitation in claim 1 required that:
within any 0.1-second period, the rate of change of illuminance of the lighting light should not exceed 0.02; and within each dynamic change period, the ratio between the minimum illuminance and maximum illuminance output by the dynamic lighting device should not exceed 50%.
This limitation was important because it connected the claimed software/control method to objectively measurable lighting parameters.
According to the case materials, the patented dynamic lighting control method was also linked to the development and regulatory approval pathway for an eye-accommodation training lighting product. The patent owner had incorporated the relevant control logic into technical requirements for a medical device product. The accused product was later registered in Guangxi as an eye-accommodation training lamp and was manufactured and sold in accordance with the corresponding medical-device technical requirements.
The Court’s Use of Medical Device Technical Requirements
A central feature of the case was the evidentiary role of the accused product’s regulatory filings.
At the patent owner’s request, the Guangzhou IP Court obtained evidence from the Guangxi Zhuang Autonomous Region Medical Products Administration, including the accused BAT-FEATL-01 eye-accommodation training lamp’s Technical Requirements and Product Inspection Report. The court noted that medical device manufacturers are required to manufacture products strictly in accordance with the registered or filed technical requirements for the product; absent contrary evidence from the defendant, products circulating in the market may be treated as complying with those technical requirements.
This became the basis for a claim-comparison analysis that, in practical effect, was similar to a standards-based infringement analysis. The court did not rely merely on product appearance or marketing language. Instead, it used the accused product’s registered medical-device technical specifications and inspection data to assess whether the claimed method steps were implemented.
The Key Technical Comparison
The dispute focused heavily on the claim limitation requiring:
Within any 0.1-second period, the illuminance change rate should not exceed 0.02, and within each dynamic change period, the ratio between minimum and maximum illuminance should not exceed 50%.
The accused product’s technical requirements and inspection report contained corresponding lighting-control parameters. The Product Inspection Report recorded that during training, the eye-accommodation training lamp’s illuminance change rate per 0.1 second ranged from 0.1% to 1.0%. The court held that this supported the finding that the accused product met the claim feature requiring the illuminance change rate within any 0.1-second period not to exceed 0.02.
The Product Inspection Report also recorded that, during the training period, the maximum-to-minimum illuminance ratio was 2.3. The court reasoned that the corresponding minimum-to-maximum ratio was therefore less than 1/2, satisfying the claim requirement that the ratio between minimum and maximum illuminance should not exceed 50%.
The court further considered the defendant’s own promotional materials for the product, which described it as using “rhythmic light” and causing the user’s eyes to respond unconsciously to changes in light intensity. The court treated this as consistent with the patent’s functional limitation that dynamic lighting enters the user’s eyes and causes changes in the eye’s structure without the user subjectively perceiving the light variation.
Method Patent Implemented by a Physical Product
Another important aspect of the decision is the court’s treatment of the relationship between the method patent and the physical lamp.
The court found that the accused technical solution fell within the protection scope of claims 1, 2, 4, and 7, and that the defendant’s prior-art defense was not established.
However, the court also drew a clear remedial boundary. The asserted patent was a dynamic lighting method and belonged to a control method for device operation. It was not a manufacturing method for producing a new product. The accused eye-accommodation training lamp was therefore treated as the hardware carrier for implementing the patented method, rather than a product directly obtained by the patented method. On that basis, the court supported the cessation of use of the patented method but did not support broader remedies, such as the destruction of inventory lamps or production molds.
This distinction is important for litigation involving software-controlled hardware. It shows that a physical device may infringe a method patent when operated, but the available remedies should still be framed according to the nature of the asserted claim.
Practical Significance
1. Medical-device regulatory filings may become decisive infringement evidence
For regulated medical devices, technical requirements submitted to or registered with the regulator may become highly probative in patent litigation. Where those requirements correspond to asserted patent claim limitations, they may serve as a powerful benchmark for infringement comparison.
2. The case has a quasi-standard-based character
This case should not be described as a conventional SEP dispute in the FRAND or telecommunications sense. However, it has a quasi-standard-based infringement feature: the accused medical device was required to comply with registered technical requirements, and those requirements corresponded to the patented method steps.
3. Method patents can be enforced against software-controlled hardware
The accused product was a lamp, but the infringement analysis focused on its operating mode, control logic, and output parameters. This is directly relevant to smart hardware, medical devices, AI-enabled equipment, and IoT products.
4. Patent strategy and regulatory strategy may reinforce each other
Where a patented technical solution is reflected in clinical trials, product technical requirements, medical-device registration materials or inspection reports, those materials may later become important evidence in enforcement.
5. Remedies should match the claim type
The court’s remedy analysis highlights the need to distinguish between stopping use of a patented method and seeking remedies against the physical carrier of that method. For method patents, remedy requests should be carefully structured to avoid overreach.
Conclusion
The Guangzhou IP Court’s decision demonstrates how Chinese courts may link a patented software/control method to the operation of a regulated medical device. By obtaining and relying on the accused product’s registered medical-device technical requirements and inspection report, the court was able to conduct a concrete claim comparison based on regulatory technical documents.
For medical device companies and software-controlled hardware manufacturers, the case is a useful reminder that regulatory filings may play a role beyond market approval. In patent litigation, they may become central evidence of how the accused product operates and whether it implements patented technical steps.