(19)

(11)

EP 3 981 073 A1

(12)

(43) Date of publication: 13.04.2022 Bulletin 2022/15 (21) Application number: 19932024.3 (22) Date of filing: 31.08.2019

(51) International Patent Classification (IPC):  H03K 3/289(2006.01) H03K 5/19(2006.01) H03K 3/3562(2006.01) (52) Cooperative Patent Classification (CPC): H03K 3/289; H03K 3/3565 (86) International application number: PCT/US2019/049248 (87) International publication number: WO 2020/247005 (10.12.2020 Gazette 2020/50)

(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 (30) Priority: 04.06.2019 US 201916431692 (71) Applicant: Little Dragon IP Holding LLC Saratoga, CA 95070 (US)	(72) Inventor: MAO, Mingming Saratoga, California 95070 (US) (74) Representative: ABG Intellectual Property Law, S.L.  Avenida de Burgos, 16D Edificio Euromor 28036 Madrid 28036 Madrid (ES)