Patent application 13952703 (US), filed 2013-07-29
Publication number: US20150027781A1
Title: MUD LIFT PUMP FOR DUAL DRILL STRING
CPC codes: E21B  21/08
E21B  21/12
Office action: rejection, dated 2015-10-14
Rejection reasons: anticipation_102
obviousness_103
Prior art cited: ref_id: 20040129427
ref_type: patent
severity: novelty_destroying
ref_id: 20140271270
ref_type: patent
severity: novelty_destroying
Final disposition: rejected (2015-10-14)