Who holds them? (Slightly outdated) Stratasys -506+ patents. no expirations. Z Corp--150+ patents. I think 3d systems bought them out.... 3D Systems- 930+ pa

Who holds them? (Slightly outdated) Stratasys -506+ patents. no expirations. Z Corp--150+ patents. I think 3d systems bought them out.... 3D Systems- 930+ patents. I counted a few expirations as well. VoxelJet- 100+ patents. Links to relevant cases: http://www.xconomy.com/boston/2013/06/24/formlabs-3d-systems-in-settlement-talks-over-3d-printing-patent/ http://www.xconomy.com/boston/2013/06/24/formlabs-3d-systems... http://www.reddit.com/r/3Dprinting/comments/18e009/3d_printing_company_receives_cease_and_desist/ http://www.reddit.com/r/3Dprinting/comments/18e009/3d_printi... http://www.wired.com/design/2012/05/3-d-printing-patent-law http://www.wired.com/design/2012/05/3-d-printing-patent-law 3D systems patent here: http://bit.ly/15avC8e http://bit.ly/15avC8e 3D systems vs formlabs and kickstarter seems to be the most popular litigation case. I'd be curious to know the royalties as well. The patents/companies have prevented individuals from building/sharing files. It's not clear about industry though.