Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8986645 | Diamond | Daniel James Twitchen, Geoffrey Alan Scarsbrook, Philip Maurice Martineau, Stephen David Williams, Ian Friel | 2015-03-24 |
| 8192713 | Method of incorporating a mark in CVD diamond | Daniel James Twitchen, Geoffrey Alan Scarsbrook, Philip Maurice Martineau | 2012-06-05 |
| 6014208 | Examining a diamond | Christopher M. Welbourn, Martin P. Smith, James Gordon Charters Smith, Philip Maurice Martineau, Martin Cooper | 2000-01-11 |
| 5883389 | Distinguishing natural from synthetic diamonds | Christopher M. Welbourn | 1999-03-16 |
| 5801819 | Distinguishing natural from synthetic diamond | Christopher M. Welbourn | 1998-09-01 |
| 5351117 | Sensing a narrow frequency band and gemstones | Andrew D. G. Stewart, Robin W. Smith, Martin P. Smith, Martin Cooper, Christopher M. Welbourn | 1994-09-27 |
| 5206699 | Sensing a narrow frequency band of radiation and gemstones | Andrew D. G. Stewart, Robin W. Smith, Martin P. Smith, Daniel J. Brink, Martin Cooper +1 more | 1993-04-27 |