Assigned to Stratasys, 5,587,913 (2013-12-14 到期 ) Assigned to DTM Corporation, 5,597,589 (2014-01-28 到期 ) Current Assignment Data Unavailable, 5,609,812 (2014-03-11 到期 ) Current Assignment Data Unavailable, 5,609,813 (2014-03-11 到期 ) Assigned to 3D Systems, 5,610,824 (2014-03-11 到期 ) Assigned to Stratasys, 5,503,785 (2014-06-02 到期 ) Current Assignment Data Unavailable, 5,637,169 (2014-06-10 到期 ) Assigned to DTM Corporation, 5,639,070 (2014-06-17 到期 ) Assigned to 3D Systems, 5,494,618 (2014-06-27 到期 ) Current Assignment Data Unavailable, 5,651,934 (2014-07-29 到期 ) Assigned to Jerry Zucker, 5,555,176 (2014-10-19 到期 ) Assigned to Jerry Zucker, 5,572,431 (2014-10-19 到期 ) Assigned to University of Southern California, 5,529,471 (2015-02-03 到期 ) Assigned to DTM Corporation, 5,733,497 (2015-03-20 到期 ) Assigned to 3D Systems, 5,762,856 (2015-06-09 到期 ) ... 3D 列印最主要的專利到期,包括, ♫ 選擇性雷射燒結 (selective sintering) 。 ♫ 光固化成形法 (stereolithography) 。 Credit: https://www.techdirt.com/articles/20140530/06531127408/120-smartphone-patent-tax-patent-royalties-cost-more-than-actual-hardware-your-phone.shtml