Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8215127 | Diamond having two-stage pavilion | Tamotsu Matsumura, Akira Itoh | 2012-07-10 |
| 7249471 | Cut design of diamonds providing plenty of visual-perceptible reflection for ornamental use and observation method thereof | Tamotsu Matsumura | 2007-07-31 |
| 7225641 | Cut design of diamonds providing plenty of visual-perceptible reflection for ornamental use and observation method thereof | Tamotsu Matsumura | 2007-06-05 |
| 6818280 | Rectangular brilliant-cut diamond | Tamotsu Matsumura, Akira Itoh | 2004-11-16 |
| 6694778 | Cut design of diamond for ornamental use | Tamotsu Matsumura | 2004-02-24 |