| Apparatus and methods for servicing 3D printers AT Hernandez, AA Berlin, BD Sweet-Block, JP Kinsley, D Katalichenko, ... US Patent 7,387,359, 2008 | 109 | 2008 |
| Apparatus and Methods for Servicing 3D Printers AT Hernandez, AA Berlin, BD Sweet-Block, JP Kinsley, D Katalichenko, ... US Patent App. 12/118,899, 2008 | 20 | 2008 |