Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12292385 | Gemstone colour grading process and grading system | Wing Yan Lee, Juan CHENG, Chun Yan Dominique Lau, Ka Wing Cheng, Ching Tom KONG +1 more | 2025-05-06 |
| 11835466 | Diamond clarity measurement process and system | Ka Wing Cheng, Kin Wing Wong, Kong CHAN, Juan CHENG, Koon Chung HUI | 2023-12-05 |
| 11326952 | Process and system for colour grading for diamonds | Koon Chung HUI, Ka Wing Cheng | 2022-05-10 |
| 11137355 | Process and system for diamond clarity measurement | Koon Chung HUI, Ka Wing Cheng | 2021-10-05 |
| 11016033 | Diamond clarity measurement process and system | Ka Wing Cheng, Kin Wing Wong, Kong CHAN, Juan CHENG, Koon Chung HUI | 2021-05-25 |
| 10762666 | Colour grading process and system for diamonds | Ka Wing Cheng, Kin Wing Wong, Kong CHAN, Juan CHENG, Koon Chung HUI | 2020-09-01 |
| 10475355 | Method of providing markings to precious stones including gemstones and diamonds, and markings and marked precious stones marked according to such a method | Koon Chung HUI, Ho CHING | 2019-11-12 |