IP High Court, Reiwa 5 (Ne) 10063 [Electric impact fastening tool] <Presiding Judge Hibiku Shimizu>
Updated: 2 days ago
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 (Ne) 10063
Display and classification checked: October 2, 2026 (not a re-review of the legal analysis)
IP High Court, Reiwa 5 (Ne) 10063 [Electric impact fastening tool] <Presiding Judge Hibiku Shimizu>
Inventive step denied.
<Difference A>
The invention uses an outer-rotor electric motor, whereas the invention in Exhibit Otsu 15 uses an inner-rotor motor.
<Difference B>
In the claimed invention, magnets are affixed with gaps on the outer peripheral side of the stator. Exhibit Otsu 15 does not expressly disclose the magnet-retention arrangement.
1. Obviousness of difference A (outer rotor)
Increasing output torque and reducing size and weight were general problems in this technical field.
Exhibit Otsu 6 also states that outer-rotor motors for electric hand tools favor higher torque.
⇒ Applying invention A in Exhibit Otsu 6, from the same technical field, to solve the problem of Exhibit Otsu 15 and replacing its inner rotor with an outer rotor was readily conceivable.
2. Obviousness of difference B (magnet fixation)
Affixing magnets to a rotor with adhesive and gaps between them was well known at the priority date.
Original article: https://lnkd.in/e2uqAK6C
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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.
Consultation and inquiries
October 2, 2026: Updated topic tags.
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