Background
Riken Technos Corporation, a Japanese specialty chemical manufacturer, sought patent protection for a coating composition used in transparent projection screens — the kind of see-through displays used in retail storefronts, automotive head-up displays, and augmented-reality applications. The Japan Patent Office (JPO) rejected the application on obviousness grounds, finding that a person of ordinary skill in the art would have arrived at the claimed resin composition by combining known prior-art references.
Riken Technos appealed to the Intellectual Property High Court, arguing that the JPO had not adequately explained why a skilled artisan would have selected the specific resin from the range of known alternatives. This is the second recent win for Riken Technos at the IP High Court — the court also restored a related UV-film patent earlier this year, similarly faulting the JPO’s obviousness reasoning.
The Court’s Holding
The IP High Court canceled the JPO’s rejection, holding that the patent office had failed to provide sufficient reasoning for why a person skilled in the art would have been motivated to select the claimed resin from the universe of known coating materials. The court found that the JPO’s analysis amounted to impermissible hindsight reconstruction: knowing the invention, the examiner identified prior-art components that could theoretically be combined, but did not explain the motivation or reason a skilled artisan would have made that specific selection before seeing Riken Technos’s disclosure.
This reasoning parallels the analytical framework used by patent offices worldwide when assessing obviousness. The JPO, like the USPTO and EPO, requires examiners to articulate why the claimed combination would have been obvious — not merely that the individual components were known.
Key Takeaways
- Japan’s IP High Court is scrutinizing JPO obviousness reasoning. Two successive reversals of Riken Technos rejections signal that the court expects examiners to articulate a specific motivation to combine or select claimed elements, not rely on general knowledge in the field.
- Hindsight bias remains a key battleground. The court’s holding reinforces the global patent-law principle that examiners cannot work backward from the invention to reconstruct an obviousness case from disparate prior-art components.
- Transparent display technology is patent-active. As transparent projection screens find commercial applications in retail, automotive, and AR, the underlying coating and materials technologies are generating significant patent activity in Japan and internationally.
Why It Matters
For companies prosecuting patents in Japan, particularly in materials science and display technology, this decision provides a useful precedent for challenging JPO obviousness rejections that lack a clear explanation of why a skilled person would have selected the claimed combination. The IP High Court’s willingness to reverse the JPO on procedural rigor grounds — twice in the same technology family — suggests that applicants have a meaningful path to appeal when they believe the examiner’s reasoning was conclusory. Practitioners filing continuation or divisional applications in Japan should take note of the court’s emphasis on motivation-to-combine analysis.