(19)

(11)

EP 3 899 402 A1

(12)

(43) Date of publication: 27.10.2021 Bulletin 2021/43 (21) Application number: 19828135.4 (22) Date of filing: 06.12.2019

(51) International Patent Classification (IPC):  F28D 15/02(2006.01) (52) Cooperative Patent Classification (CPC): F28D 15/0283 (86) International application number: PCT/US2019/064803 (87) International publication number: WO 2020/131410 (25.06.2020 Gazette 2020/26)

(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: 18.12.2018 US 201816224164 (71) Applicant: Microsoft Technology Licensing, LLC Redmond, Washington 98052 (US)	(72) Inventor: DELANO, Andrew Douglas Redmond, Washington 98052-6399 (US) (74) Representative: CMS Cameron McKenna Nabarro Olswang LLP  Cannon Place 78 Cannon Street London EC4N 6AF London EC4N 6AF (GB)