Issued Patents 2021
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11180915 | Longspan stay-in-place liners | George David Richardson, Semion Krivulin | 2021-11-23 |
| 11053676 | Structure-lining apparatus with adjustable width and tool for same | George David Richardson, Semion Krivulin, Yue Heng Leung | 2021-07-06 |