3D打印巨头3D SYSTEMS公司专利态势分析
刘艳丽1,2,*(
),何微3,吴鸣1
),何微3,吴鸣1
Patent Trend Analysis for 3D SYSTEMS
Yanli Liu1,2,*(),Wei He3,Ming Wu1
),Wei He3,Ming Wu1
图4. 3D SYSTEMS公司专利技术排名前20位的 IPC代码 来源：Thomson Innovation?, www.thomsoninnovation.com
.
