IP High Court, Reiwa 5 (Gyo-Ke) 10144 [Ultra-high-voltage DC power supply for a food electric-field treatment apparatus] <Presiding Judge Nakahira>
更新日：4 日前
Article information
Article type: Case note
Category: Patents
Topics: Inventive step, Patent corrections
First published on this website: October 2, 2026
Case number (as stated in the source): Reiwa 5 (Gyo-Ke) 10144
Display and classification checked: October 2, 2026 (not a re-review of the legal analysis)
IP High Court, Reiwa 5 (Gyo-Ke) 10144 [Ultra-high-voltage DC power supply for a food electric-field treatment apparatus] <Presiding Judge Nakahira>
References 1–4 added in the JPO decision merely supplied corroborating evidence that the technique was well known in various fields, in response to the plaintiff's written challenge to its well-known status.
⇒ They did not establish a new ground for refusal, so another notice of reasons for refusal was unnecessary.
The skilled person knows not only the technical knowledge of food electric-field treatment apparatuses, but also the related field of high-voltage DC power supplies used as their components.
⇒ Difference 1: Supplying ultra-high-voltage DC without a high-voltage transformer. Reference 2 and supplementary references 1–4 show that the Cockcroft–Walton circuit is a well-known power-supply circuit used in many fields requiring high-voltage DC, including everyday electrical appliances. Readily conceivable.
⇒ Difference 2: Connecting a high-resistance resistor between the high-voltage output and GND terminals. Based on references 2 and 3, measuring voltage by dividing it through high- and low-resistance resistors connected in series is well known in high-voltage generators. Readily conceivable.
⇒ No inventive step.
Original article: https://lnkd.in/eRHaAt7W
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Update and correction history
Substantive corrections and supplements are recorded separately from classification, related-article, and display maintenance.
October 2, 2026: First publication of the author's LinkedIn text. Article type, classification, issue tags, source, and consultation guide were added.
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October 2, 2026: Updated topic tags.
