Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12292385 | Gemstone colour grading process and grading system | Wing Yan Lee, Juan CHENG, Chun Yan Dominique Lau, Wing Chi TANG, Ching Tom KONG +1 more | 2025-05-06 |
| 12030217 | Method of marking a diamond, markings formed from such methods and diamonds marked according to such method | Yau Chuen YIU, Koon Chung HUI | 2024-07-09 |
| 11879859 | Process for determining the type of a diamond | Yau Chuen YIU, Kong CHAN, Chun Hong SHAM, Juan CHENG, Koon Chung HUI | 2024-01-23 |
| 11835466 | Diamond clarity measurement process and system | Kin Wing Wong, Kong CHAN, Juan CHENG, Wing Chi TANG, Koon Chung HUI | 2023-12-05 |
| 11467101 | System for ascertaining optical characteristics of gemstone | Koon Chung HUI | 2022-10-11 |
| 11326952 | Process and system for colour grading for diamonds | Koon Chung HUI, Wing Chi TANG | 2022-05-10 |
| 11137355 | Process and system for diamond clarity measurement | Koon Chung HUI, Wing Chi TANG | 2021-10-05 |
| 11016033 | Diamond clarity measurement process and system | Kin Wing Wong, Kong CHAN, Juan CHENG, Wing Chi TANG, Koon Chung HUI | 2021-05-25 |
| 10762666 | Colour grading process and system for diamonds | Kin Wing Wong, Kong CHAN, Juan CHENG, Wing Chi TANG, Koon Chung HUI | 2020-09-01 |