(19)
(11) EP 3 737 832 A1

(12)

(43) Date of publication:
18.11.2020 Bulletin 2020/47

(21) Application number: 18900224.9

(22) Date of filing: 09.01.2018
(51) International Patent Classification (IPC): 
E21B 47/00(2012.01)
G01D 5/353(2006.01)
 E21B 47/10(2012.01)
(86) International application number:
PCT/US2018/012927
(87) International publication number:
WO 2019/139561 (18.07.2019 Gazette 2019/29)
(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:
MA MD TN

(71) Applicant: Formlabs, Inc.
Somerville, MA 02143 (US)

(72) Inventors:
  • FRANTZDALE, Benjamin
    Harvard, MA 01451 (US)
  • KEENAN, Justin
    Medford, MA 02155 (US)

(74) Representative: Cockerton, Bruce Roger 
Carpmaels & Ransford LLP One Southampton Row
London WC1B 5HA
London WC1B 5HA (GB)

   


(54) OPTICAL SENSING TECHNIQUES FOR CALIBRATION OF AN ADDITIVE FABRICATION DEVICE AND RELATED SYSTEMS AND METHODS