(19)

(11)

EP 3 679 219 A1

(12)

(43) Date of publication: 15.07.2020 Bulletin 2020/29 (21) Application number: 18865333.1 (22) Date of filing: 14.11.2018

(51) International Patent Classification (IPC):  E21B 7/14(2006.01) E21D 9/10(2006.01) E21B 7/15(2006.01) E21D 13/00(2006.01) (86) International application number: PCT/US2018/060961 (87) International publication number: WO 2020/101666 (22.05.2020 Gazette 2020/21)

(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: ARCBYT, INC. Berkeley CA 94705 (US)	(72) Inventor: HELMING, Troy Anthony Oakland, CA 94618 (US) (74) Representative: Mathys & Squire  The Shard 32 London Bridge Street London SE1 9SG London SE1 9SG (GB) (56) References cited: :