Research on Status Quo of Not-in-Force Invention Patents in China’s Petroleum Industrial Area

WU Dan, NIU Liquan, ZHANG Qi

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中国科技核心期刊（中国科技论文统计源期刊）
ISSN 2095-8870　CN 31-2107/G3
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Competitive Intelligence ›› 2021, Vol. 17 ›› Issue (3) : 30-41.

Research on Status Quo of Not-in-Force Invention Patents in China’s Petroleum Industrial Area

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