Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9222893 | Modified apparatus and method for assessment, evaluation and grading of gemstones | Graham Alfred Hornabrook, Stuart Marchant, Kathryn Elizabeth Primmer, Angus Nelson Hornabrook, Peter Bruce Sutton +4 more | 2015-12-29 |
| 8436986 | Apparatus and methods for assessment, evaluation and grading of gemstones | Graham Alfred Hornabrook, Stuart Marchant, Kathryn Elizabeth Primmer, Peter Bruce Sutton, Angus Nelson Hornabrook +4 more | 2013-05-07 |