(19)

(11)

EP 3 993 915 A1

(12)

(43) Date of publication: 11.05.2022 Bulletin 2022/19 (21) Application number: 20745420.8 (22) Date of filing: 02.07.2020

(51) International Patent Classification (IPC):  B07B 1/28(2006.01) B07B 1/48(2006.01) B07B 1/46(2006.01) B07B 13/16(2006.01) (52) Cooperative Patent Classification (CPC): B07B 1/28; B07B 1/46; B07B 1/48; B07B 13/16; B07B 2201/04; B07B 2230/01 (86) International application number: PCT/US2020/040696 (87) International publication number: WO 2021/003390 (07.01.2021 Gazette 2021/01)

(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: 02.07.2019 US 201916460764 (71) Applicant: Derrick Corporation Buffalo, NY 14225 (US)	(72) Inventors: COLGROVE, James R. East Aurora, New York 14052 (US) PERESAN, Michael L. New York 14145 (US) (74) Representative: Boult Wade Tennant LLP  Salisbury Square House 8 Salisbury Square London EC4Y 8AP London EC4Y 8AP (GB)