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EP 4 251 369 A1

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(43) Date of publication: 04.10.2023 Bulletin 2023/40 (21) Application number: 20963807.1 (22) Date of filing: 25.11.2020

(51) International Patent Classification (IPC):  B24B 11/04(2006.01) B24B 11/02(2006.01) B24B 23/04(2006.01) B24B 11/00(2006.01) B24B 11/06(2006.01) (52) Cooperative Patent Classification (CPC): B24B 11/08; B24B 41/02; B24B 41/068 (86) International application number: PCT/US2020/062387 (87) International publication number: WO 2022/115105 (02.06.2022 Gazette 2022/22)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (71) Applicant: SRI LLC Lewes, Delaware 19958 (US)	(72) Inventors: JENG, Phong-Ning Taichung City, 406 (TW) HSIEH, Edward Kuan Hsiung Torrance, California 90503 (US) YANG, Chun-Hsien Changhua County, 526 (TW) (74) Representative: Lang, Christian  LangPatent Anwaltskanzlei IP Law Firm Ingolstädter Straße 5 80807 München 80807 München (DE)