| 6014208 |
Examining a diamond |
Martin P. Smith, James Gordon Charters Smith, Paul Martyn Spear, Philip Maurice Martineau, Martin Cooper |
2000-01-11 |
| 5883389 |
Distinguishing natural from synthetic diamonds |
Paul Martyn Spear |
1999-03-16 |
| 5880504 |
Examining a diamond |
Martin P. Smith, James Gordon Charters Smith, Martin Cooper, Philip Maurice Martineau |
1999-03-09 |
| 5835200 |
Method and apparatus for examining an object |
Martin P. Smith, Robin W. Smith |
1998-11-10 |
| 5801819 |
Distinguishing natural from synthetic diamond |
Paul Martyn Spear |
1998-09-01 |
| 5536943 |
Method and apparatus for examining an object |
Martin P. Smith |
1996-07-16 |
| 5351117 |
Sensing a narrow frequency band and gemstones |
Andrew D. G. Stewart, Robin W. Smith, Martin P. Smith, Martin Cooper, Paul Martyn Spear |
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 |
| 5177585 |
P-N-P diamond transistor |
— |
1993-01-05 |
| 4663522 |
Integrating sphere device for measuring transmission of light in objects |
Martin P. Smith |
1987-05-05 |
| 4645922 |
Integrating sphere arrangement for producing size-corrected color signals |
Martin P. Smith, Andrew D. G. Stewart |
1987-02-24 |
| 4461568 |
Assessing the color of gemstones and the like |
Robert W. Ditchburn, Andrew D. G. Stewart |
1984-07-24 |