CN205572195U - 管线法兰管口喷砂防护封堵装置 - Google Patents
管线法兰管口喷砂防护封堵装置 Download PDFInfo
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CN112824046A (zh) * | 2019-11-20 | 2021-05-21 | 宝山钢铁股份有限公司 | 油套管外螺纹喷砂用内壁组合式防砂堵头及其防堵方法 |
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CN112824046A (zh) * | 2019-11-20 | 2021-05-21 | 宝山钢铁股份有限公司 | 油套管外螺纹喷砂用内壁组合式防砂堵头及其防堵方法 |
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C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
CP01 | Change in the name or title of a patent holder | ||
CP01 | Change in the name or title of a patent holder |
Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee after: OFFSHORE OIL ENGINEERING Co.,Ltd. Patentee after: CHINA NATIONAL OFFSHORE OIL Corp. Co-patentee after: OFFSHORE OIL ENGINEERING (QINGDAO) Co.,Ltd. Address before: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee before: OFFSHORE OIL ENGINEERING Co.,Ltd. Patentee before: CHINA NATIONAL OFFSHORE OIL Corp. Co-patentee before: OFFSHORE OIL ENGINEERING (QINGDAO) Co.,Ltd. |
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CF01 | Termination of patent right due to non-payment of annual fee | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160914 |