Blowout prevention device for lifting and lowering of sucker rod
LI HONG, CUI XIMIN, MA XIUHUA, GUO FENG, ZHANG ZHENGUO, GUO SHIDONG, GAO HAIRONG, ZHU CHANGCHUN, WU ZHENDE, YANG TINGBO, DU XIANG, YANG GUOBIN, PENG XIZHI, YANG YANG, SONG SANJUN, PAN ZHENGQIANG
Year of Publication 11.07.2012
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Year of Publication 11.07.2012
Patent
Gate valve preventing drop of valve rod and valve plate
LI HONG, CUI XIMIN, GUO SHIDONG, LIU QINGHUA, GAO HAIRONG, MA XIRONG, TIAN SHUGUANG, WANG MIN, YANG TINGBO, YANG GUOBIN, QU MING, ZHAO QINGRU, WANG FUBIAO, SU ZHIQIANG, MA JUNBO
Year of Publication 11.07.2012
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Year of Publication 11.07.2012
Patent
Connecting bolt of coupler
LI CHUNGUANG, LI HONG, MA XIUHUA, CUI XIMIN, NING FANG, ZHANG ZHENGUO, GUO SHIDONG, LIU QINGHUA, GAO HAIRONG, BAI LI, DONG BAOMING, ZHANG CHANGLIN, ZHANG XIANQIU, YANG TINGBO, YANG GUOBIN, SU ZHIQIANG, MA JUNBO
Year of Publication 04.07.2012
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Year of Publication 04.07.2012
Patent
Polish rod operating protective cover
YU WEIQIAO, GOU MEILI, TANG YUANCHAO, HU YINGYING, GAO HAIRONG, WANG YIRAN, YU HONGYING, WANG JINFENG, LIANG XIAODONG, XING XUEHUA, KONG LINGYAN, ZHOU WEIDONG
Year of Publication 29.12.2010
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Year of Publication 29.12.2010
Patent