Patent application 13152937 (US), filed 2011-06-03
Publication number: US20110297265A1
Title: Electromagnetic Oil Pipe Plugger
CPC codes: E21B  33/13
E21B  33/064
E21B  33/129
E21B  33/134
F16L  55/1283
Office action: rejection, dated 2015-10-14
Rejection reasons: obviousness_103
subject_matter_101
indefiniteness_112
Prior art cited: ref_id: 20010032723
ref_type: patent
severity: obviousness
Final disposition: granted (2015-10-14)