When did 3D printing's patent expire? - Quora
3D Printing Patent Landscape | Articles | Finnegan | Leading IP+ Law Firm
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Timeline of the 3D Printing History - ASME
WIPS global: 3D Printing Patent will Expire soon!
Stratasys heated build chamber for 3D printer patent US6722872B1 set to expire this week - 3D Printing Industry
Key 3D printing patent expired yesterday - Boing Boing
Expired Patents a Draw-card for 3D Printing (Click here for full article) | Latest 3D Printer News Article | 3D Printing Solutions
Expired Patents a Draw-card for 3D Printing (Click here for full article) | Latest 3D Printer News Article | 3D Printing Solutions
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The influence of patents on 3D printing evolution | Creax
How expiring patents are ushering in the next generation of 3D printing | TechCrunch
The influence of patents on 3D printing evolution | Creax
3D Printer patent 1992 : r/3Dprinting
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History of 3D Printing: When Was 3D Printing Invented? | All3DP
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Stratasys FDM Patent Expiration - YouTube
