Patent application 13809151 (US), filed 2013-01-08
Publication number: US20130112428A1
Title: CIRCULATION SUB AND METHOD FOR USING SAME
CPC codes: E21B  21/019
E21B  34/12
E21B2200/06
E21B2200/04
E21B2200/03
E21B  21/10
E21B  21/103
E21B  21/106
E21B  33/068
F16K  11/056
F16K  11/0655
F16K  11/0716
F16K  11/074
Office action: rejection, dated 2015-10-16
Rejection reasons: anticipation_102
obviousness_103
Prior art cited: ref_id: 20060254822
ref_type: patent
severity: novelty_destroying
ref_id: 7571773
ref_type: patent
severity: novelty_destroying
ref_id: 20060254822
ref_type: patent
severity: novelty_destroying
ref_id: 4452322
ref_type: patent
severity: novelty_destroying
Final disposition: granted (2015-10-16)