Paul M. Spear

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Patents Grantslast 30 patents

Information Patent Grant
Diamond
- Patent number 8,986,645
- Issue date Mar 24, 2015
- Element Six Limited
- Daniel James Twitchen
- B44 - DECORATIVE ARTS
Information Patent Grant
Method of incorporating a mark in CVD diamond
- Patent number 8,192,713
- Issue date Jun 5, 2012
- Daniel James Twitchen
- A44 - HABERDASHERY JEWELLERY
Information Patent Grant
Examining a diamond
- Patent number 6,014,208
- Issue date Jan 11, 2000
- Gersan Establishment
- Christopher Mark Welbourn
- G01 - MEASURING TESTING
Information Patent Grant
Distinguishing natural from synthetic diamonds
- Patent number 5,883,389
- Issue date Mar 16, 1999
- Paul Martyn Spear
- G01 - MEASURING TESTING
Information Patent Grant
Distinguishing natural from synthetic diamond
- Patent number 5,801,819
- Issue date Sep 1, 1998
- Gersan Establishment
- Paul Martyn Spear
- G01 - MEASURING TESTING
Information Patent Grant
Sensing a narrow frequency band and gemstones
- Patent number 5,351,117
- Issue date Sep 27, 1994
- Gersan Establishment
- Andrew D. G. Stewart
- B07 - SEPARATING SOLIDS FROM SOLIDS SORTING
Information Patent Grant
Sensing a narrow frequency band of radiation and gemstones
- Patent number 5,206,699
- Issue date Apr 27, 1993
- Gersan Establishment
- Andrew D. G. Stewart
- B07 - SEPARATING SOLIDS FROM SOLIDS SORTING

Patents Applicationslast 30 patents

Information Patent Application
Method of incorporating a mark in cvd diamond
- Publication number 20070148374
- Publication date Jun 28, 2007
- Daniel James Twitchen
- C30 - CRYSTAL GROWTH
Information Patent Application
Diamond
- Publication number 20070036921
- Publication date Feb 15, 2007
- Daniel James Twitchen
- B44 - DECORATIVE ARTS