Patent application 13983509 (US), filed 2013-08-02
Publication number: US20140291031A1
Title: Drillstring Valve
CPC codes: E21B  21/103
E21B2200/06
Office action: rejection, dated 2015-10-19
Rejection reasons: anticipation_102
obviousness_103
indefiniteness_112
Prior art cited: ref_id: 20120305265
ref_type: patent
severity: novelty_destroying
ref_id: 20120305265
ref_type: patent
severity: novelty_destroying
ref_id: 5499687
ref_type: patent
severity: novelty_destroying
Final disposition: granted (2015-10-19)